Save money: replace failed batteries in emergency lights

摘要

There are many different types of emergency lighting. The ones we're talking about here look just like standard fluoro fittings. In the electrical trade they're called lu-minaires and can be "maintained" and "non maintained". The difference is that maintained emergency luminaires are "on at all times" - normally powered by the mains so they light an exit route 24 hours a day; whereas non-maintained fixtures only come on when power fails.