I'm going to attemp to build one, and I can't find the answer anywhere.
Mine's not an answer but an add-on question. I know very little about electronics but would like to make an LED black light out of an old TYPE B bulb, does anyone know how I choose the wattage of the resistor or the OHMs of it? or do I choose the wattage by the amount of light I want given off?
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Most have only one, but there is no real limit, beyond your own preferences.