Definitions for "PHOTOFLOOD"
A lamp used by photographers which gives a bright white light. Because it has a thin filament, it gives a good flash effect (eg lightning), but has a relatively short life, so should not be left on for any length of time.
Continuous burning lights (as opposed to flash) -- usually with incandescent lamps
Bright tungsten filament bulb used as an artificial light source. The bulb is over -run and so has a short life. (see Tungsten light)