Quote:
Originally Posted by tinx
UV rays
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Yes, puck lights have a UV glass filter. Maybe the bottle glass reduces UV somewhat, it's certainly thick enough.
These guys
http://scientificsonline.com/
may have UV filters but I don't what a safe level of UV is. The intensity of sunlight?
http://en.wikipedia.org/wiki/File:Solar_Spectrum.png
The lamp maker knows.
The lamp pulls 4 A so a 40 Amp-Hour battery would give you 10 hours or less of runtime. The switch has to stand a 40 A surge for a few dozen milliseconds until the filament heats. It's a "tungsten load," slightly less stressful than a "motor load."
50 W distributed over the surface area of a Coke bottle should hardly warm it but the bulb may be designed to run in a free-air environment.