COOL LIGHT

CD 1963086 E&MP 25.024

Electric Lamps

May 21, 1938

Fluorescent lamps, as much as 200 times as efficient as today's hot incandescent lights, have just been made available by two of America's largest lamp manufacturers.

Invisible ultraviolet light generated inside the tubes bombards chemical-coated walls, which fluoresce, giving out light but practically no heat.

Original Caption by Science Service