Smart Emergency Lighting Units for AC LED Tubes

HEI Series for T5/T8 LED Tubes

Exclusive Features

  • Automatic lamp-matching for different brands

  • One model for all T5/T8 lamps

  • Constant brightness

  • Battery output regulation

  • Output voltage clamping

  • Test button with lamp compatibility test

  • -ΔV full charge detection

  • 6 hours charging time

  • 3 charging modes


  • Automatic Lamp-matching, lamp driver will adjust itself for different lamps
  • Battery discharge time is constant and unaffected by lamp load. This guarantees rated discharge duration
  • Constant lamp output at emergency mode with regulation up to 93%
  • Lamp output voltage never exceeds 220/240Vac even at lamp-open
  • Fast charging time of 6 hours
  • -ΔV battery full detection prevents battery from over-charging and extends battery life
  • Pre-charging for unhealthy battery, normal charging for healthy battery and pulse charging for fully charged battery
  • Test button includes lamp compatibility test
  • Maintained and non-maintained modes
  • Lamp output short-circuit, over-current and open-circuit and lamp-flickering protections
  • Deep-discharge shutdown for battery protection
  • High efficient switching mode charger with short-circuit and over-current protections
  • Isolated low voltage test switch
  • Bi-colour LED indicators
  • NiCd rechargeable battery, NiMH as option

Electrical Characteristics

Rated supply voltage 220-240 VAC (-10%, +10%)
Supply frequency 50-60 Hz
Changeover time <0.3 Sec
Recharge time <6 hrs
Battery cut-off voltage <1.0V/cell
Ambient temp (ta) 0 … +50°C
Standby power <1W
Max. case temp (tc) 65°C
Weight 140 g
Supported Lamp type T5/T8 AC LED lamps

Charge Hours

Max Discharge Hour Supported

The 32-bit Processor

A powerful 32-bit ARM processor is built into the system to manage all lamp driving, charging and all kinds of protections

It is capable of sampling lamp and battery at 2 million samples per second. The data is analysed and used to adjust lamp and battery respectively in real time.

The processor also provides many protection functions.  Lamp output voltage is clamped and regulated to prevent high voltage from damaging AC LED lamp. Lamp open, lamp flickering and overcurrent protections are fully implemented in digital way.

Automatic Lamp Matching for any lengths of T5 & T8 LED Lamps

AC LED tubes always have compatibility issues with traditional emergency kits. The problems include:

  • AC LED lamp cannot start or flickers
  • Emergency kit output voltage can reach 380Vac which is a great safety issue
  • AC LED lamps may draw too much or too little battery current, this results in insufficient discharge time or low brightness output.
  • Maintenance is difficult as replacement lamps have to be identical.
  • LED lamp and emergency kits have to be tested by suppliers before installation.

The HLI emergency lighting units are fully software controlled and can analyse lamp characteristics and adjust lamp driver in real time. Both T5 and T8 lamps are supported. And almost all AC LED tubes on the market are compatible. Just one model for all kind of T8 and T5 AC LED tubes.

Automatic Discharge Time Matching

In emergency mode, AC LED lamp load will be various from lamp to lamp. Traditional emergency driver has to be modified for each lamp model in order to keep the rate discharge time.

HLI emergency driver, by analysing lamp and battery data, it can adjust lamp output and also battery discharge current so that rated discharge time is always unchanged.

Traditional AC LED tube emergency kit needs manufacturers to fine-tuning for each lamp model. Without fine-tuning, battery may discharge more current and discharge time is not guaranteed.

Charging Modes and -ΔV Detection

Three battery charging modes are available:

  1. Pre-charging: This is for flat battery with extremely low voltage or even short-circuit at charger. Charging current is set to extremely small to prevent from excessive charging current while battery can still be slowly recovered with it.
  2. Normal Charging: With a healthy battery, the charger will start starting with maximum charging time of 6 hours. If battery was partially charged, the charge will also use -ΔV to delete battery full and terminate charging in just a few minutes. The battery will not be overcharged and overheated.
  3. Pulse Charging: After battery is fully charged, the charger will charge battery around 1 second per minute to compensate battery self-discharging.

Test Button with Lamp Compatibility Test

The test button performs normal changeover, but also conducts lamp compatibility test. If lamp is not compatible or defective, it will switch off lamp within 3 seconds. For compatible lamps, it will keep running while test button is pressed.

Constant Light Output During Emergency Mode

During emergency mode, the traditional emergency kits can only maintain lamp output at 55% when battery voltage is exhausted. HEI driver has a power regulation feature so that it can regulate AC LED tube to more than 90%. Lamp brightness is almost constant and unaffected by battery voltage.

Rich Set of Protections

Lamp Protections

  • Lamp open protection
  • Lamp over-voltage protection
  • Lamp output short-circuit protection
  • Lamp output over-current protection
  • Lamp flickering protection

Charger Protections

  • Charger open protection
  • Charger output short-circuit protection


LED Indications

The infrared remote control makes battery change-over testing is easier with just a press on the controller. It also provide 5-steps of dimming control for normal AC operation.

green-led-on-off Battery Charging
green-led-on-on Battery Full
red-led-on-on Battery Discharging
red-led-on-off System Errors

Maintained Mode

Wiring Diagrams

Non-maintained Mode


HEI Enclosure A & B Dimensions
Compliances Icon


FSD Circular Letter No. 1/2006: PPA-104(A) 5th Rev Fire Safety Standards for Emergency Lighting

BS 5266 part 1 2016 Emergency lighting. Code of practice for the emergency lighting of premises

EN 1838 2013 Lighting applications. Emergency lighting

EN 61347-2-13 Lamp controlgear. Particular requirements for d.c. or a.c. supplied electronic controlgear for LED modules

EN 61951-1 Secondary cells and batteries containing alkaline or other non-acid electrolytes – Portable sealed rechargeable single cells – Part 1: Nickel-cadmium

EN 55015 Limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment

EN 61000-3-2 Electromagnetic compatibility (EMC). Limits. Limits for harmonic current emissions (equipment input current ≤ 16 A per phase)

EN 61000-3-3 Electromagnetic compatibility (EMC). Limits. Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection

EN 61547 Equipment for general lighting purposes. EMC immunity requirements

Ordering Information

Model Lamp
Battery Output
Power (W)
Power (W)
Power (W)
Enclosure Discharge
Hours (W)
HEI-0810 T5/T8 LED Tubes H08S10F (9.6V, 1Ah) 2.8 3.0 <1W A 2
HEI-0820 T5/T8 LED Tubes H08S20F (9.6V, 2Ah) 6.0 5.0 <1W B 2
HEI-0830 T5/T8 LED Tubes H08C30F (9.6V, 3Ah) 6.0 7.0 <1W B 3