Don's bulbs rare light bulbs and lamps glossary of terms definition of: INCANDESCENT What is INCANDESCENT? Incandescence is when a black body (like a filament) is heated to point of emitting visible photons. Also see incandescent bulb. references for this page: INCANDESCENT, INCANDESCENCE, INCANDESCENT BULBS references to this page: BULB DARKENING, COLOR RENDERING INDEX, COLOR TEMPERATURE, COMPACT FLUORESCENT LAMP, ELLIPTICAL REFLECTOR, ENERGY POLICY ACT, GETTER, GLASS, HALOGEN BULB, HORIZONTAL DISTRIBUTION, INCANDESCENT BULB, INDUCTION LIGHTING, KRYPTON, NEODYMIUM, PAR LAMP, REFLECTOR LAMP, VOLT