15 years
Update
Last winter we installed 24 low voltage bed lights where we had a nearby electrical supply. To the other 24 beds we fitted LED lights with 3 rechargeable AAA batteries. The batteries have a life of over 12 hours and so far this season (5 and a half months) just over half the batteries have had to be recharged - not onerous at all. This is probably due to the fact that not much reading is done when they return to the hostel at 5 or 6am. :D
Sounds good. How much did the LED lights cost at the beginning?
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