{"id":7397,"date":"2026-09-06T13:34:03","date_gmt":"2026-09-06T13:34:03","guid":{"rendered":"https:\/\/www.jialinghang.com\/?p=7397"},"modified":"2026-09-20T07:07:09","modified_gmt":"2026-09-20T07:07:09","slug":"how-to-choose-a-led-emergency-driver-selection-guide-for-specifiers","status":"publish","type":"post","link":"https:\/\/www.jialinghang.com\/ru\/how-to-choose-a-led-emergency-driver-selection-guide-for-specifiers\/","title":{"rendered":"How to Choose a LED Emergency Driver: Selection Guide for Specifiers"},"content":{"rendered":"

LED Emergency Driver Buyer Guide<\/h2>\n

The right LED emergency driver is determined by three things you already know about the installation: the host fixture’s normal LED driver output, the emergency duration your local code mandates, and the conformity mark the inspector will look for on the label. Match the emergency driver’s DC output window to the LED module’s forward voltage and current; verify the battery pack can sustain that load for the required time without dropping below the inverter’s under-voltage threshold; and confirm the supplier holds test reports or certification documents for the standards active in your market.<\/p>\n

This page is an emergency driver selection guide<\/strong> that turns each installation variable into a hard specification requirement. It covers driver architecture, maintained versus non-maintained wiring, battery chemistry trade-offs, and the standards that actually gate entry in the UK, Europe, Middle East, Southeast Asia, Africa and Latin America.<\/p>\n

Fixture Type and Wattage as the Starting Point<\/h3>\n

The host fixture dictates everything else. A 40W LED panel light with a 120-200V DC forward voltage and 200mA constant-current normal driver needs an emergency driver with an output window covering 120-200V DC at 200mA, not a 12V or 24V DC model. Hymark’s LED Emergency Driver For LED Panel Lights<\/a> range typically covers 50-200V DC output windows at 150-300mA, with driven emergency loads of 3W to 15W. For LED tubes and linear lights, the forward voltage is usually lower\u201430-80V DC\u2014so the matching emergency driver must have a narrower output window, often 30-80V DC at 100-250mA, with emergency loads of 3W to 10W.<\/p>\n

Emergency output as a percentage of normal output matters for spacing compliance.<\/strong> EN 1838 requires minimum illuminance on escape routes; if the emergency driver only delivers 10% of normal lumens, the fixture spacing designed for 100% output may fail inspection. Most LED emergency drivers deliver 25% to 100% of normal output. A 40W panel at 25% emergency output gives 10W; at 500 lm\/W LED efficacy, that is roughly 1,250 lumens emergency. Check whether your specifier requires 50% or 100% for the application.<\/p>\n

Driver Architecture and Output Characteristics<\/h3>\n

Two architectures dominate: constant-current inverters with changeover relay<\/strong>, and switch-mode emergency drivers with integrated switching<\/strong>. The relay-based design physically disconnects the normal driver and connects the emergency inverter to the LED module. This is robust but adds a mechanical component with finite cycle life. Switch-mode designs use electronic changeover, faster and silent, but more complex to repair in the field.<\/p>\n

The output window is critical. A driver rated 120-200V DC at 200mA \u00b15% will not start a module with 210V forward voltage. Request the supplier’s output-voltage-versus-load curve across the 90-minute or 3-hour discharge profile. Battery voltage sags as state-of-charge drops; the inverter must maintain regulation until the under-voltage cutout trips.<\/p>\n

Emergency Duration and Battery Specification<\/h3>\n

Local codes determine duration. 90 minutes<\/strong> is standard for North America (UL 924), the Middle East and many Southeast Asian markets. 3 hours<\/strong> is mandatory under BS 5266-1 for UK escape routes and EN 1838 for many European applications. Some African markets follow British practice; others follow IEC patterns with 90 minutes.<\/p>\n

Battery chemistry determines whether the duration is achievable within the driver’s physical envelope:<\/p>\n\n\n\n\n\n\n\n
Chemistry<\/th>\nNominal V<\/th>\nTypical Capacity<\/th>\nCycle Life<\/th>\nCharge Time<\/th>\nWeight<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
NiCd<\/td>\n3.6V<\/td>\n1500-4000mAh<\/td>\n500 cycles<\/td>\n24h<\/td>\nHeavy<\/td>\nLegacy, wide temperature tolerance<\/td>\n<\/tr>\n
Li-ion 18650<\/td>\n3.7V<\/td>\n2000-3500mAh<\/td>\n500-800 cycles<\/td>\n12-16h<\/td>\nModerate<\/td>\nHigher energy density, UN 38.3 required for air freight<\/td>\n<\/tr>\n
LiFePO4<\/td>\n3.2V<\/td>\n1500-3000mAh<\/td>\n1500-2000 cycles<\/td>\n8-12h<\/td>\nModerate<\/td>\nThermal stability, longer cycle life, lower nominal voltage per cell<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A 3-hour duration at 10W emergency output from a 3.2V LiFePO4 pack requires roughly 9.4Wh usable energy, plus inverter efficiency losses at 85-90%. That demands 3000mAh at 3.2V (9.6Wh nominal) minimum. At 90 minutes and 5W, a 1500mAh LiFePO4 pack suffices. Cheaper NiCd options exist<\/strong>\u2014buyers save 15-25% on BOM cost\u2014but lose cycle life, add weight, and face stricter disposal regulations in the EU under the Battery Directive.<\/p>\n

Maintained Versus Non-Maintained Operation<\/h3>\n

Non-maintained<\/strong> wiring: the emergency driver is energised only when mains fails. The LED module is off during normal operation, or powered separately by the normal driver. Wiring is simpler\u2014permanent live and switched live to the normal driver, permanent live to the emergency driver\u2014but the fixture gives no indication the emergency function is healthy until tested.<\/p>\n

Maintained<\/strong> wiring: the emergency driver powers the LED module continuously, or switches seamlessly to maintain the same light output during mains failure. Required in some escape route applications where the luminaire is the only source of artificial light. The wiring adds a switched live to the emergency driver; some architectures use DALI or a dedicated maintained-live terminal. Confirm the driver’s maintained-mode current draw and whether it reduces battery charge rate when operating in maintained state.<\/p>\n

Mains Voltage and Market-Specific Requirements<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Market<\/th>\nNominal Mains<\/th>\nFrequency<\/th>\nExpected Mark<\/th>\nKey Standard<\/th>\n<\/tr>\n<\/thead>\n
UK<\/td>\n230V<\/td>\n50Hz<\/td>\nUKCA \/ CE (transitional)<\/td>\nBS 5266-1, EN 60598-2-22<\/td>\n<\/tr>\n
EU<\/td>\n230V<\/td>\n50Hz<\/td>\nCE<\/td>\nEN 60598-2-22, EN 1838, EN 62034<\/td>\n<\/tr>\n
North America<\/td>\n120-277V<\/td>\n60Hz<\/td>\ncULus \/ UL<\/td>\nUL 924<\/td>\n<\/tr>\n
Middle East<\/td>\n220-240V<\/td>\n50Hz<\/td>\nSASO \/ CE \/ IECEx (hazardous)<\/td>\nIEC 60598-2-22 variant<\/td>\n<\/tr>\n
Southeast Asia<\/td>\n220-240V<\/td>\n50Hz<\/td>\nSNI \/ PSB \/ CE<\/td>\nAS\/NZS 2293 (Australia-aligned) or local adoption<\/td>\n<\/tr>\n
Africa<\/td>\n220-240V<\/td>\n50Hz<\/td>\nSONCAP \/ CE \/ Local<\/td>\nOften British-derived or IEC<\/td>\n<\/tr>\n
Latin America<\/td>\n127V \/ 220V<\/td>\n60Hz<\/td>\nINMETRO \/ Local<\/td>\nVaries; 127V requires 100-140V input range<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Input voltage range must cover local variance. A driver rated AC 220-240V \u00b110% handles 198-264V; this fails in markets with 127V nominal. Hymark’s wide-range drivers cover AC 85-265V for global compatibility, but confirm the specific model\u2014narrow-range 220-240V variants cost 8-12% less and suit single-market OEM programmes.<\/p>\n

Test Facility and Compliance Documentation<\/h3>\n

The inspector does not trust the product; they trust the documentation. Ask the supplier for:<\/p>\n

    \n
  • Test reports to EN 60598-2-22 (thermal, endurance, fault conditions)<\/li>\n
  • Photometric data to EN 1838 (if making spacing claims)<\/li>\n
  • Automatic test function to EN 62034 (if supplying self-test or DALI models)<\/li>\n
  • Battery UN 38.3 test summary for lithium chemistries (mandatory for air and sea freight)<\/li>\n<\/ul>\n

    Manual test key<\/strong>: installer presses a button or inserts a test key; lamp switches to emergency mode. Lowest cost, highest labour burden over 10 years.<\/p>\n

    Self-test<\/strong>: driver automatically performs brief functional tests and reports fault via LED indicator. Adds 10-15% to driver cost; reduces maintenance labour.<\/p>\n

    DALI<\/strong>: integrated into building management systems, reports status digitally, schedules tests. Adds 25-35% to driver cost; requires DALI-compatible infrastructure.<\/p>\n

    Shortlist Checklist<\/h3>\n

    Before requesting quotation, confirm:<\/p>\n

      \n
    • [ ] Host fixture LED module: forward voltage range V DC, current <\/em><\/strong>mA, normal wattage ___W<\/li>\n
    • [ ] Required emergency output: ___% of normal, or minimum ___ lumens<\/li>\n
    • [ ] Duration required: ___ minutes \/ hours<\/li>\n
    • [ ] Wiring type: maintained \/ non-maintained<\/li>\n
    • [ ] Mains voltage at site: V, <\/em><\/strong>Hz<\/li>\n
    • [ ] Local standard and conformity mark expected: ___<\/li>\n
    • [ ] Test facility required: manual \/ self-test \/ DALI<\/li>\n
    • [ ] Ambient temperature range at installation: ___\u00b0C (LiFePO4 tolerates -20\u00b0C to +60\u00b0C; NiCd wider; Li-ion 18650 narrower)<\/li>\n
    • [ ] IP\/IK rating if exposed: IP \/ IK<\/em><\/strong><\/li>\n
    • [ ] Battery chemistry preference and transport constraints: ___<\/li>\n<\/ul>\n

      Types and Configurations of LED Emergency Driver<\/h2>\n

      Choosing an LED emergency driver means matching five variables to your installation: the normal fixture wattage and LED architecture, the required emergency output as a percentage of normal light, the duration the battery must sustain that output, whether the circuit is maintained or non-maintained, and the test and compliance standard your local inspector enforces. Get any of these wrong and the driver either fails to light the LEDs in an emergency, drains the battery before occupants evacuate, or fails inspection because the documentation does not match the mark on the product label.<\/p>\n

      \n

      Selection by Driven Load Class and Emergency Output Level<\/h3>\n\n\n\n\n\n\n\n\n\n\n
      Type or Class<\/th>\nTypical Rating or Output<\/th>\nDuration or Runtime<\/th>\nBest Suited For<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
      Low-wattage reduced-output driver<\/td>\n3W\u201310W emergency, 10%\u201330% of normal lumen output<\/td>\n90 min or 3 hr<\/td>\nLED tubes, small panels, linear fixtures up to 20W normal<\/td>\nSmallest battery pack, lowest cost; light output may not meet EN 1838 minimum illuminance in large open areas<\/td>\n<\/tr>\n
      Medium-wattage reduced-output driver<\/td>\n10W\u201320W emergency, 20%\u201350% of normal lumen output<\/td>\n90 min, 2 hr, or 3 hr<\/td>\nLED panels 30W\u201360W, linear office fixtures<\/td>\nTrade-off between battery size and usable egress light; verify luminaire photometric file at reduced wattage<\/td>\n<\/tr>\n
      Full-power emergency driver<\/td>\nMatches normal fixture wattage 1:1, 100% lumen output<\/td>\n90 min standard, 2 hr or 3 hr on request<\/td>\nLED high bays, industrial linear, task-critical areas<\/td>\nLargest battery pack, often LiFePO4; weight and cost increase significantly; check ceiling load rating<\/td>\n<\/tr>\n
      Self-contained emergency luminaire driver<\/td>\nIntegrated battery and inverter, no remote capability<\/td>\n90 min or 3 hr<\/td>\nRetrofit of non-emergency fixtures by OEMs or wholesalers<\/td>\nAll-in-one unit limits thermal design flexibility; battery life sensitive to LED module heat<\/td>\n<\/tr>\n
      DALI-addressable self-test driver<\/td>\n10W\u201350W emergency output, programmable via DALI bus<\/td>\n90 min or 3 hr<\/td>\nSmart buildings, facilities with central BMS or compliance logging<\/td>\nRequires DALI-compliant normal driver and wiring; higher unit cost offset by reduced manual testing labour<\/td>\n<\/tr>\n
      Strip-specific constant-voltage driver<\/td>\n12V or 24V DC emergency output, 2W\u201310W per metre<\/td>\n90 min or 3 hr<\/td>\nLED strip installations in coves, signage, stair nosings<\/td>\nMust match strip voltage exactly; voltage drop over long runs affects emergency uniformity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \n

      Low-Wattage Reduced-Output Driver<\/h3>\n

      This class covers units rated for normal LED loads up to roughly 20W and emergency outputs of 3W to 10W, typically yielding 10% to 30% of normal lumens. The battery is usually a NiCd 3.6V 700mAh to 1500mAh pack or a small Li-ion 18650 3.7V 2000mAh cell, giving 90 minutes or 3 hours of runtime depending on the milliamp-hour reserve. Input voltage is commonly AC 85\u2013265V universal, with inverter output in the range of DC 50\u2013250V at constant current, matched to the LED string voltage. Charge time is 16 to 24 hours for NiCd, 6 to 12 hours for Li-ion. These drivers suit electrical contractors retrofitting LED tubes or small panels in corridors and storage rooms where EN 1838 or BS 5266-1 minimum illuminance is easy to achieve with modest output. The limitation is clear: a 10% lumen fraction from a 15W fixture may deliver only 150\u2013200 lumens, which falls below the 1 lux horizontal minimum in larger spaces or rooms with dark surfaces. Buyers normally include lighting wholesalers supplying bulk retrofit kits and facility managers covering small commercial buildings. Ask the supplier for the actual lumen fraction at the rated emergency wattage, not just the percentage claim.<\/p>\n

      \n

      Medium-Wattage Reduced-Output Driver<\/h3>\n

      Rated for normal loads of 30W to 60W, these drivers deliver 10W to 20W in emergency mode, typically 20% to 50% of normal output. Battery packs move up to Li-ion 18650 7.4V 2200mAh configurations, or LiFePO4 6.4V 1500mAh for longer cycle life. Runtime options are 90 minutes, 2 hours, or 3 hours. Input voltage windows are AC 100\u2013277V or 220\u2013240V region-specific, with inverter output DC 100\u2013280V at 150\u2013350mA constant current. Charge time ranges from 8 to 16 hours. This is the default choice for M&E consultants specifying office LED panels and linear fixtures in the UK and Europe under EN 60598-2-22, because it balances battery size against the fact that 30%\u201350% of normal output from a 40W panel usually satisfies EN 1838 uniformity and minimum illuminance in typical 2.7m ceiling offices. The trade-off is against full-power units: the battery is smaller and cheaper, but if the normal fixture is already at the low end of the space category, the reduced output may require additional luminaires to maintain compliance. OEMs adding emergency versions to their own fixtures often select this class for their mainstream catalogue.<\/p>\n

      \n

      Full-Power Emergency Driver<\/h3>\n

      Full-power drivers maintain 100% of normal fixture wattage and lumen output in emergency mode, so a 100W LED high bay remains a 100W LED high bay when the mains fail. Battery packs are substantially larger: LiFePO4 12.8V 3000mAh to 6000mAh, or multiple Li-ion 18650 cells in 3S2P or 4S2P arrangements, delivering 90 minutes at full wattage. Some 3-hour variants exist but require battery capacities above 9000mAh and weigh 2kg to 4kg. Input voltage is typically AC 100\u2013277V or 220\u2013240V, with inverter output tracking the LED driver voltage window, often DC 200\u2013400V at 500mA to 1500mA. Charge time is 12 to 24 hours. Cycle life is 500 to 800 for LiFePO4, 300 to 500 for Li-ion 18650, depending on depth of discharge and ambient temperature. These drivers are specified by industrial procurement officers for manufacturing halls, warehouses, and sports facilities where task lighting must continue at full level for safe shutdown procedures, not merely egress. The downside is cost\u2014typically 3\u00d7 to 5\u00d7 the price of a reduced-output unit\u2014and the structural load of the battery pack on the luminaire or ceiling. UL 924 and NFPA 101 applications in North America often demand full-power output for certain occupancy types. Verify that the luminaire housing is rated for the battery mass and that the driver has a separate mounting bracket if the battery is remote-mount.<\/p>\n

      \n

      Self-Contained Emergency Luminaire Driver<\/h3>\n

      This format integrates the battery, inverter, and control circuitry in a single enclosure that mounts inside or on the fixture, with no separate remote battery box. Typical ratings are 5W to 25W emergency output, 90 minutes or 3 hours, with NiCd 3.6V\u20136V or small Li-ion packs. Input AC 85\u2013265V, output DC 30\u2013200V constant current. IP ratings range from IP20 for indoor office use to IP65 for weatherproof applications. The audience here is luminaire OEMs and lighting distributors who want a single SKU that converts a standard panel or tube into an emergency product without engineering a custom battery compartment. The limitation is thermal: the battery sits in the same housing as the LED module, and sustained normal operation at 50\u00b0C ambient can halve Li-ion cycle life. EN 62034 and EN 60598-2-22 both impose temperature tests; ask the supplier for the declared Tc point and the battery derating curve above 25\u00b0C. These units rarely offer DALI or sophisticated self-test; most have a manual test key or basic auto-test with a visible status LED.<\/p>\n

      \n

      DALI-Addressable Self-Test Driver<\/h3>\n

      DALI-compatible emergency drivers connect to the Digital Addressable Lighting Interface bus, allowing centralised scheduling of functional and duration tests, logging of results, and fault reporting to a building management system. Typical ratings are 10W to 50W emergency output, with LiFePO4 or Li-ion battery packs sized for 90 minutes or 3 hours. Input AC 100\u2013277V or 220\u2013240V, output DC 100\u2013280V constant current. The DALI protocol per IEC 62386-202 handles the emergency function, while the normal driver handles dimming and switching. Facility managers and building operators in the UK, Europe, and the Middle East specify these for large commercial portfolios where manual testing labour costs exceed the hardware premium. The constraint is wiring infrastructure: the circuit needs DALI bus cabling separate from mains, and the normal driver must be DALI-compatible. If the existing installation uses 1\u201310V or phase-cut dimming, the DALI emergency driver cannot communicate test results centrally without a gateway or full retrofit. Self-test cycles are programmable\u2014typically monthly functional tests and annual duration tests per EN 62034\u2014but the installer must commission the DALI addresses correctly or the system reports false faults.<\/p>\n

      \n

      Strip-Specific Constant-Voltage Driver<\/h3>\n

      LED strip installations require emergency drivers that output 12V or 24V DC, not the high-voltage constant current used for panels and tubes. These drivers deliver 2W to 10W per metre of strip, with battery packs of Li-ion 11.1V 2200mAh or LiFePO4 12.8V 1500mAh, sustaining 90 minutes or 3 hours. Input AC 100\u2013240V, output 12V or 24V DC regulated. The critical specification is voltage matching: a 24V strip on a 12V emergency driver will not illuminate, and a 12V strip on a 24V driver will overcurrent and fail. LED density matters too\u2014120 LEDs per metre at 14.4W\/m draws more than 60 LEDs per metre at 7.2W\/m, so the driver wattage and battery capacity must be calculated per metre of installed strip. These units suit lighting designers specifying cove lighting, stair nosing strips, or signage where egress marking is integrated into architectural lighting. The limitation is voltage drop: over 5m runs at 12V, even in emergency mode, the far end may fall below the LED forward voltage and extinguish. Installers should verify strip cut length, PCB copper weight (typically 2oz or 3oz for longer runs), and whether the driver supports remote battery mounting to reduce heat at the strip.<\/p>\n

      \n

      Emergency Driver Selection Checklist<\/h3>\n

      Use this to turn your installation into a specification:<\/p>\n

        \n
      • Fixture normal wattage and LED architecture<\/strong>: Constant-current high-voltage string, or constant-voltage 12V\/24V strip?<\/li>\n
      • Required emergency output fraction<\/strong>: 10%\u201330% for basic egress, 50% for functional safety, 100% for full task continuation?<\/li>\n
      • Duration<\/strong>: 90 minutes (minimum for most jurisdictions), 2 hours (common in Middle East and some Asian codes), or 3 hours (UK healthcare, certain industrial)?<\/li>\n
      • Mains voltage<\/strong>: AC 220\u2013240V 50Hz (UK\/Europe\/Middle East\/Africa), AC 100\u2013277V 60Hz (North America\/Latin America), or universal 85\u2013265V?<\/li>\n
      • Operation mode<\/strong>: Non-maintained (emergency only on power loss) or maintained (emergency circuit energised continuously, switched via changeover relay)?<\/li>\n
      • Test facility<\/strong>: Manual test key, automatic self-test per EN 62034, or DALI-addressable with central logging?<\/li>\n
      • Applicable standard<\/strong>: EN 60598-2-22 and EN 1838 for Europe; BS 5266-1 for UK; UL 924 for North America; AS\/NZS 2293 for Australia\/New Zealand; or local adoption of IEC 61347?<\/li>\n
      • Battery chemistry and transport<\/strong>: LiFePO4 or Li-ion for energy density and cycle life; NiCd for lowest cost but heavier and lower capacity. Confirm UN 38.3 test summary and IATA\/IMDG lithium battery shipping documentation for air or sea freight.<\/li>\n
      • Ambient conditions<\/strong>: IP20 for dry interiors, IP65 for humid or dusty locations; ambient temperature range 0\u00b0C to +45\u00b0C or -20\u00b0C to +60\u00b0C extended?<\/li>\n
      • Mounting and enclosure<\/strong>: Internal driver tray, remote battery box, or integrated self-contained?<\/li>\n<\/ul>\n

        Price positioning for the Hymark range, based on market observation: low-wattage reduced-output units typically fall in the $8\u2013$15 FOB range; medium-wattage units $15\u2013$30; full-power drivers $45\u2013$90; DALI self-test variants add 20%\u201340% premium over their manual-test equivalents. MOQ is generally 500 pieces for standard models, 100\u2013200 for customised voltage or connector configurations. Sample lead time is 7\u201310 days; production lead time 25\u201335 days after order confirmation. Battery products ship as UN 38.3 Class 9 dangerous goods, requiring proper carton labelling and IMDG declaration for sea freight, or IATA PI 966\/967 packing for air freight.<\/p>\n

        \"led
        LED Emergency Driver assembled and function tested before shipment<\/figcaption><\/figure>\n

        Specifications and How to Read Them<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        Parameter<\/th>\nEntry Level<\/th>\nMid Range<\/th>\nHigh Specification<\/th>\n<\/tr>\n<\/thead>\n
        Driven load (normal mode)<\/td>\n8\u201315 W<\/td>\n15\u201340 W<\/td>\n40\u201380 W<\/td>\n<\/tr>\n
        Emergency output<\/td>\n3 W, ~300 lm (20% of normal)<\/td>\n8 W, ~800 lm (50% of normal)<\/td>\n20 W, ~2000 lm (100% of normal)<\/td>\n<\/tr>\n
        Input voltage \/ frequency<\/td>\nAC 220\u2013240 V \/ 50 Hz<\/td>\nAC 85\u2013265 V \/ 50\u201360 Hz<\/td>\nAC 100\u2013277 V \/ 50\u201360 Hz<\/td>\n<\/tr>\n
        DC output window<\/td>\n9\u201342 V \/ 200 mA<\/td>\n9\u201360 V \/ 350 mA<\/td>\n9\u201380 V \/ 700 mA<\/td>\n<\/tr>\n
        Emergency duration<\/td>\n90 minutes<\/td>\n2 hours<\/td>\n3 hours<\/td>\n<\/tr>\n
        Battery chemistry \/ capacity<\/td>\nNiCd 3.6 V 1200 mAh<\/td>\nLi-ion 18650 3.7 V 2600 mAh<\/td>\nLiFePO4 3.2 V 3000 mAh<\/td>\n<\/tr>\n
        Charge time<\/td>\n24 hours<\/td>\n16 hours<\/td>\n6 hours<\/td>\n<\/tr>\n
        Cycle life<\/td>\n300\u2013500 cycles<\/td>\n800\u20131000 cycles<\/td>\n1500\u20132000 cycles<\/td>\n<\/tr>\n
        Test facility<\/td>\nManual test key<\/td>\nSelf-test per EN 62034<\/td>\nSelf-test + DALI-2<\/td>\n<\/tr>\n
        Wiring mode<\/td>\nNon-maintained<\/td>\nNon-maintained or maintained<\/td>\nMaintained or non-maintained<\/td>\n<\/tr>\n
        IP \/ IK rating<\/td>\nIP20 \/ IK02<\/td>\nIP65 \/ IK07<\/td>\nIP65 \/ IK08<\/td>\n<\/tr>\n
        Ambient temperature<\/td>\n0 \u00b0C to +45 \u00b0C<\/td>\n\u201310 \u00b0C to +50 \u00b0C<\/td>\n\u201320 \u00b0C to +60 \u00b0C<\/td>\n<\/tr>\n
        Dimensions (L\u00d7W\u00d7H)<\/td>\n120 \u00d7 40 \u00d7 25 mm<\/td>\n160 \u00d7 55 \u00d7 30 mm<\/td>\n200 \u00d7 70 \u00d7 35 mm<\/td>\n<\/tr>\n
        Mounting<\/td>\nPlastic clip<\/td>\nMetal bracket<\/td>\nMetal bracket + cable gland<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        How to Read the Datasheet Line by Line<\/h3>\n

        Input Voltage Range and Frequency<\/strong>
        \nThis tells you where the driver can be installed without a separate transformer. AC 220\u2013240 V \/ 50 Hz covers the UK and most of Europe. AC 85\u2013265 V \/ 50\u201360 Hz also accepts 120 V in North America or 277 V in commercial US circuits. AC 100\u2013277 V narrows the bottom end slightly but still spans most global markets. Check that your site’s nominal voltage sits comfortably inside the range, not at the extreme edge.<\/p>\n

        Driven Load in Watts<\/strong>
        \nThis is the normal-mode LED load the driver can switch and supply. The emergency driver does not replace the normal LED driver; it sits in parallel and takes over when mains fails. Match this figure to your fixture’s actual LED module consumption, not the driver’s maximum headline rating. A 40 W panel with a 60 W driver still needs an emergency driver rated for 40 W of LED load.<\/p>\n

        DC Output Voltage Window and Current<\/strong>
        \nThe inverter stage inside the emergency driver outputs DC at a specific voltage range and constant current. Typical windows are 9\u201342 V, 9\u201360 V, or 9\u201380 V, with currents from 200 mA to 700 mA or higher. Your LED module’s forward voltage must fall inside this window. If the module wants 48 V and the driver tops out at 42 V, the emergency circuit will not start or will run at reduced output.<\/p>\n

        Emergency Output in Lumens and as Percentage of Normal<\/strong>
        \nEN 1838 and BS 5266-1 specify minimum illuminance on escape routes; the driver datasheet translates this into what the fixture actually produces. Entry-level units often deliver 10\u201320% of normal lumens. Mid-range units reach 50%. Full-power emergency drivers give 100% of normal output, matching the maintained mode requirement for some industrial and retail applications. Ask for the lumen figure at the end of the rated duration, not at battery full charge, because battery voltage sag reduces output over time.<\/p>\n

        Emergency Duration<\/strong>
        \n90 minutes is the legal minimum in the UK and EU for most premises. Two hours appears in healthcare, assembly buildings, and some Middle East codes. Three hours is common in Southeast Asia (Singapore, Malaysia) and parts of Africa. The battery capacity in mAh must support the duration at the stated wattage, including inverter efficiency losses. A 3.7 V 2600 mAh Li-ion pack stores 9.62 Wh; at 80% inverter efficiency and 3 W output, that yields roughly 2.5 hours.<\/p>\n

        Battery Chemistry Voltage and Capacity<\/strong>
        \nNiCd 3.6 V packs are cheap, tolerate temperature extremes, and ship without UN 38.3 restrictions, but carry cadmium content and offer 300\u2013500 cycles. Li-ion 18650 3.7 V cells deliver higher energy density, 800\u20131000 cycles, but need UN 38.3 test reports for air freight and IMDG documentation for sea freight. LiFePO4 3.2 V cells give the longest cycle life at 1500\u20132000 cycles, better thermal stability, and lower fire risk, at higher initial cost and slightly lower nominal voltage per cell. Capacity in mAh determines duration; voltage determines how many cells must be series-connected to reach the inverter’s input requirement.<\/p>\n

        Charge Time and Cycle Life<\/strong>
        \nCharge time matters for commissioning and after deep discharge tests. NiCd units need 24 hours for a full charge. Li-ion drops to 16 hours. LiFePO4 with dedicated CC-CV charging reaches full in 6 hours. Cycle life indicates how many full discharge-charge cycles the battery survives before capacity drops to 80% of rated. At one functional test per month and one full duration test per year, a 500-cycle battery lasts roughly 10\u201315 years in service; a 2000-cycle battery outlives the LED module.<\/p>\n

        Test Facility<\/strong>
        \nManual test key means a physical switch or fuse removal to simulate mains failure. Self-test per EN 62034 automates this with a timer circuit that runs brief functional tests and reports status via an LED indicator. DALI-2 self-test adds digital communication to a building management system, logging test results and fault codes. DALI requires a DALI bus power supply and compatible control gear; do not specify it unless the building has or will have a DALI infrastructure.<\/p>\n

        Maintained or Non-Maintained Wiring<\/strong>
        \nNon-maintained: the emergency driver only activates when mains fails. The fixture is dark or lit by separate normal circuits during everyday operation. Maintained: the emergency driver powers the LEDs continuously via a changeover relay that switches to battery when mains drops. Maintained wiring needs an additional switched live input to the driver. Some drivers accept either mode with terminal configuration; others are dedicated to one mode.<\/p>\n

        IP and IK Rating<\/strong>
        \nIP20 suits indoor ceiling cavities and dry utility rooms. IP65 with cable glands allows surface mounting in car parks, warehouses, and covered external soffits. IK07 (2 joules) resists casual impact from tools or trolleys. IK08 (5 joules) suits corridors with wheeled traffic and sports facilities. The emergency driver must match or exceed the fixture’s own ratings if it mounts externally.<\/p>\n

        Ambient Temperature Range<\/strong>
        \nBattery chemistry is the limiting factor. NiCd performs at 0 \u00b0C to +45 \u00b0C. Li-ion and LiFePO4 extend lower to \u201310 \u00b0C or \u201320 \u00b0C, but high-temperature ageing accelerates above +45 \u00b0C. In unventilated ceiling voids in hot climates, specify the high end carefully. In cold storage or exterior Nordic installations, verify the low-temperature discharge curve because lumen output and duration both fall as battery temperature drops.<\/p>\n

        Dimensions and Mounting<\/strong>
        \nMeasure the available space inside the luminaire body or in the ceiling void. Entry-level units at 120 mm fit most LED panels. High-wattage units with larger battery packs need 200 mm or more. Metal bracket mounting with slotted holes allows retrofit adjustment. Check that the driver weight does not exceed the fixture’s internal load rating if it mounts on the LED module’s heat sink.<\/p>\n

        Trade Terms and Export Practicalities<\/h3>\n

        FOB, CIF, CFR, EXW<\/strong>
        \nEXW (Ex Works) means the buyer collects from the factory and arranges everything. FOB (Free On Board) includes delivery to the departure port and loading on vessel; the buyer pays ocean freight and insurance. CFR (Cost and Freight) adds ocean freight to the destination port, but risk transfers at loading; the buyer still needs insurance. CIF (Cost Insurance Freight) includes freight and marine insurance to the destination port. For first-time buyers, CIF offers cost predictability. For regular volume buyers, FOB or CFR often reduces total landed cost through freight consolidation.<\/p>\n

        L\/C and T\/T<\/strong>
        \nT\/T (telegraphic transfer) with 30% deposit and 70% against bill of lading is standard for established relationships. L\/C (letter of credit) adds bank fees, typically 1\u20133% of order value, but protects both parties when credit terms are unknown. Small samples or initial orders below USD 5000 usually run on 100% T\/T advance or PayPal.<\/p>\n

        HS Code<\/strong>
        \nLED emergency drivers generally fall under HS 8504.40 (static converters) or 8539.50 (parts of electric filament or discharge lamps). Confirm with your freight forwarder because classification affects duty rate and any import licensing for battery-containing products.<\/p>\n

        CE and UKCA Marking<\/strong>
        \nCE marking indicates conformity with EU directives (EMC, LVD, RoHS). UKCA replaces CE for Great Britain post-Brexit. The markings are the supplier’s declaration, not a third-party certificate. Ask for the Declaration of Conformity and the test reports it references; do not accept a logo on the label alone. For Northern Ireland, CE or UK(NI) marking still applies under the Windsor Framework.<\/p>\n

        UN 38.3 Battery Test Report<\/strong>
        \nAny lithium battery shipment by air (IATA) or sea (IMDG) requires UN 38.3 testing: altitude simulation, thermal test, vibration, shock, external short circuit, impact\/crush, overcharge, and forced discharge. The report must reference the exact cell model and pack configuration. Ask for the UN 38.3 test summary in English; freight agents and customs may request it. NiCd packs do not require UN 38.3 but may need separate hazardous material declarations depending on cadmium content.<\/p>\n

        Packing List and Certificate of Origin<\/strong>
        \nThe packing list states carton dimensions, gross and net weight, and quantity per carton. Typical packing for emergency drivers is 20\u201350 units per carton, 10\u201312 cartons per plywood pallet. Certificate of Origin (CO) is issued by the local chamber of commerce and may be required for preferential tariff treatment under free trade agreements. For UK-EU trade, a REX statement or importer’s knowledge may substitute.<\/p>\n

        Decision Shortlist<\/h3>\n