Question

What gases are in a fluorescent and incandescent bulb?

Answer 1

Old fashioned incandescent lamp bulbs, which are becoming obsolete, are filled with argon. Newer (and brighter) "halogen" incandescent bulbs are filled wth bromine vapor. The bromine allows the tungsten filament to operate at a higher temperature of about 3500 K.

Fluorescent bulbs used to be filled with argon and mercury vapor. More modern and more efficient ones are filled with krypton and mercury vapor. The light comes from the mercury vapor and phosphors on the inner tube wall that re-emit ultraviolet light from the mercury vapor.

For more info, see
http://www.lamptech.co.uk/Documents/FL%20Gases.htm

Answer 2

Thanks you!