Emergency and Exit Lighting in Bangladesh

Why isn't the generator enough?

A generator takes time to start and transfer load, and it can fail to start at all. In those seconds a floor of hundreds of workers is in darkness. Emergency lighting covers that gap instantly from its own battery, and keeps working if the generator never comes on or the fire damages the supply.

Frequent power cuts in Bangladesh also mean emergency batteries cycle more than in many countries, so battery quality and regular testing matter more here. Heat in unventilated ceilings and stair cores shortens battery life further, which we take into account when choosing fittings and where to mount them.

Self-contained or central battery?

Self-contained fittings have their own battery and charger inside each light or sign. They are simple to install and a single failure affects only one fitting, but every battery must be tested and eventually replaced across the building. Self-testing versions run their own monthly and annual tests and flag a failed fitting.

A central battery system feeds all fittings from one battery room through fire-resistant cable. Testing and battery replacement happen in one place, which suits large factories and towers, but the cabling must be protected and the battery room becomes critical. We recommend based on building size and maintenance capacity.

What makes exit signs effective?

Signs must be visible from anywhere on the escape route and point the right way at every turn. Exit signs listed to UL 924 are tested for visibility and for operation on battery. ISO 7010 sets the familiar green running-person symbol, which reads without words, useful for a mixed workforce.

In smoke, signs near the ceiling disappear first. Low-level photoluminescent wayfinding strips along stairs and corridors help people find the exit when smoke fills the upper part of the room. They need no power at all, but they must be charged by normal lighting, so they are placed where the lights are on during working hours.