theres many types available at about the £15 mark....
so for less than £20 who likes the idea of having a portable rechargeable light (with about a 3 hour run time) which will come on when the power goes off and gives you the chance to switch it off and conserve battery life if its not dark when you loose power to use later?
kit needed:
Emergency light fitting (id go LED our local wholesaler does them for £15 ish as he says they cost less to buy in as the battery packs are smaller thus cheaper due to the LED's lower consumption over older fluorescent tubes ) you can get brigher or not so bright ones just compare specifications
but i have one of these to hand for nothing as it just failed the full 3 hour test due to been a few years old so (it was dimming at the 3 hour mark so needed replacing so i wombled it from the skip by the time a company works out what battery it takes orders one in pays postage then pays someone to strip the light fitting down its cheaper just to replace the entire light and then you also ensure next test it wont fail wanting a new fluorescent tube or the PCB goes faulty) (battery packs are about the £7 mark 1/2 the cost of a new light which comes with a 3 year warranty usually)
http://www.emergency-lighting-direct.co ... d-kit.html
its getting used....
also needed is a cable gland to secure the cable, a length of flex (twin and earth) a plug and a miniture toggle / rocker switch.......
its a very simple mod
wire the light up as per "none maintained" instructions to flex and fit plug ensure gland is tight to prevent cable been pulled out ( i knotted the cable inside the light too)
cut into the battery live wire and install switch. and drill casing to allow toggle to poke out and fit nut.....
to charge plug into mains and switch your new switch to ON .. green status light comes on (charging can take upto 14 hours from flat)
Now leave it plugged in and should power fail the light illuminates.....
should you wish to then save the battery power the switch lets you turn it off.....



obviously you loose the full water proof qualitys with that switch but a few more pence would get a waterproof boot for the toggle if you wanted...