A power cut in a warehouse, factory, office or data centre is more than an inconvenience. Work stops, people move around in the dark, and in critical spaces even a few minutes without light can be risky. Backup emergency lights solve this by keeping the lights on automatically the moment the power fails – with no inverter, no generator start-up delay and no separate wiring.
This guide explains how backup emergency lights work, how much backup time you really need, and how to choose the right emergency light for your site.
What Are Backup Emergency Lights?
A backup emergency light is a normal LED light fitting with its own built-in battery and charging circuit. On mains power it works like any other LED light and keeps its battery charged. When the power fails, it switches to battery automatically and keeps lighting the space until power returns or the battery runs out.
At MULTiSSCAN, we make backup emergency versions of the lights businesses use every day:
- 2×2 emergency LED panel lights for offices, hospitals, banks and data centres
- 15W to 40W emergency LED panels in round, square and recessed versions
- Emergency high bay lights for warehouses, factories and godowns
- Emergency LED flood lights for yards, gates and outdoor areas
- AC/DC emergency street lights for campuses, roads and parking areas
How Do Battery Backup Emergency Lights Work?
Each MULTiSSCAN backup emergency light has three key parts:
- LED light and driver – runs the light on normal AC mains power.
- Battery backup unit – a Lithium Iron Phosphate (LiFePO4) battery with a smart charger and protection circuit.
- Automatic changeover – detects a power failure and switches the light to battery instantly, with no visible flicker.
Our backup units use a boost circuit that steps up the battery voltage to drive the full LED board. This means the whole panel stays lit during a power cut – not just a small corner of LEDs, as with many cheaper emergency lights.
Why LiFePO4 batteries?
- Longer life – many more charge cycles than lead-acid or ordinary lithium-ion batteries
- Safer chemistry – thermally stable and well suited to installation inside ceilings and fittings
- No maintenance – no topping up, no acid, no battery room
- Compact and light – our 12.8V 6Ah backup unit measures just 178 × 109 × 81 mm
How Much Backup Time Do You Need?
Backup time depends on two things: the energy stored in the battery and how much power the light draws in emergency mode. The simple formula is:
Backup time (hours) = usable battery energy (Wh) ÷ emergency output (W)
For example, our 12.8V 6Ah LiFePO4 battery stores 76.8 Wh, of which about 61 Wh is usable after conversion losses. Here is what that means in practice:
| Emergency output | Approx. backup time |
|---|---|
| 75 W | about 45 minutes |
| 50 W | about 1 hour 15 minutes |
| 40 W | about 1 hour 30 minutes |
| 30 W | about 2 hours |
| 20 W | about 3 hours |
This is the key point many buyers miss: a light does not need to run at full brightness during a power cut. Lowering the emergency output a little gives much longer backup. That is why we calibrate every order to the customer’s site – you tell us the backup time and light level you need, and we set the emergency output to match.
Typical requirements by space
- Data centres and server rooms – bright, steady light for 1–2 hours so staff can keep working until power is restored or the DG set takes over
- Warehouses and factories – enough light to stop machines safely and move goods or people out of aisles
- Offices, banks and hospitals – comfortable light at desks, counters, corridors and nursing stations
- Staircases, exits and parking – safe movement until power returns
Built-in Battery vs Central Inverter
Many buildings rely on a central inverter or UPS for lighting backup. Backup emergency lights with built-in batteries have several advantages:
- No separate wiring – each light is connected to normal mains, so they are easy to add to existing buildings
- No single point of failure – if one battery fails, the other lights keep working
- No inverter room or battery bank to buy, house and maintain
- Easy to expand – add more emergency lights whenever you need them
- Lower running cost – no inverter losses while on mains power
Case Study: Emergency LED Panels at a Data Centre in Hyderabad
A data centre in Hyderabad installed MULTiSSCAN 2×2 emergency LED panels so that its operations area stays lit during power failures. In the video below, the mains supply is switched off and the panels continue on battery without interruption.
Watch the power-cut test video on YouTube
Over three months, we supplied 120 emergency 2×2 panels to customers across Telangana, Haryana, Gujarat, West Bengal, Tamil Nadu and Mizoram – most of them businesses that could not afford to lose light during power cuts.
How to Choose the Right Backup Emergency Light
- Match the fitting – choose the same type you use today (2×2 panel, round panel, high bay, flood or street light) so it fits your ceiling or pole.
- Decide the backup time – 45 minutes, 1 hour or 2 hours, depending on how long your typical power cuts last and whether a DG set takes over.
- Decide the light level – full brightness or reduced, safe-movement light during the power cut.
- Check the battery type – prefer LiFePO4 for long life and safety.
- Ask about the full board staying lit – make sure the whole fitting lights up, not just a few LEDs.
Frequently Asked Questions
Do backup emergency lights need an inverter?
No. Each light has its own battery and charger and works on normal mains wiring.
How long does the battery take to charge?
The battery charges automatically whenever mains power is on. Leave the light on mains and it is always ready for the next power cut.
Can I use them as normal lights every day?
Yes. On mains power they work as normal LED lights. The battery is used only during power failures.
Can the backup time be customised?
Yes. We set the emergency output for each order to give the backup time and light level your site needs.
Do you supply outside Mumbai?
Yes. We supply backup emergency lights across India, including bulk and project orders.
Get the Right Backup Emergency Lights for Your Site
Tell us your space, the number of lights, and the backup time you need – we will recommend the right model and set it up for you. See our full range of backup emergency lights, call +91 75063 16571 or email sales@multisscan.com.