Take care of bulbs Turn the microscope off after use. Do not keep the light on all day as this will shorten the bulb’s life. Always have extra bulbs handy, not just one but at least two. You don’t ...

These models had a 12 Volt input to allow the use of a car battery to light the bulb. A LED headlight also runs off 12 Volts, so it was easy for [Andy] to choose a light source for this repair.

Physicists have created the world's smallest incandescent lamp using a filament made from a single carbon nanotube only 100 atoms wide. Invisible to the untrained eye, the filament appears as a ...