I would like a small lamp that's easy to move from place to place that produces the correct UVB wavelengths for reptiles and amphibians. There are UVB bulbs that fit standard fixtures, but I can't find a battery-operated fixture like that (or 5v/USB, or 12v even maybe with a power tool battery pack - but that's going to be expensive). There are battery-operated lamps, but I can't find one that produces UVB (except for nail lamps? Maybe?). I'd like to spend not much money. Does what I want exist?