Tests described which compare three bulb technologies: incandescent (a hot wire in a vacuum), cfl (compact florescent) and led (light emitti...

My home made DIY parabolic reflector spreads light evenly from a single tube over a whole shelf. A standard IKEA shelf is used. Using only...

I think they do. This was not a scientific experiment but a demonstration. Try it and let me know if this works for you. I can't remem...