"I also keep a dozen homemade disposable battery lights, they are cheaper than chemical light sticks, give more light, for longer, and can be turned off."
Please explain.
Sue
Seconded. Google left me empty.
These are very simple, some would say crude.
A plastic battery holder for 2D cells, with a 2.4 volt 0.7 amp flashlight bulb.
The bulb is soldered to two short pieces of wire, which are soldered to the terminals of the battery holder.
No switch is needed, insert batteries to light, remove batteries to turn off.
Run time 10 hours continous or about 15 hours total of intermitant use, with alkaline cells
Cost of battery holder about 25 pence, cost of bulb 5 pence, wire and solder ,estimate less than a penny.
Alkaline D cells if bought in bulk are less than £1.00 for two.
Total cost about £1.00/£1.25, glow sticks cost more than that and give a lot less light.
I also made some smaller versions with 2 AA cells and a 0.3 amp bulb, these are smaller and lighter in weight and use cheaper batteries, but the run time and light output are less.
Although very basic, these are reliable due to the small number of potential loose contacts.
They are cheap enough to give away, and I allways keep some to hand.