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-- An incandescent light bulb has no gas at all in it. It's a complete vacuum. If any air leaks into it,

the filament soon oxidizes and the bulb "burns out". However some incandescent light bulbs are filled with an inert gas, argon.

-- Most fluorescent lights have Mercury vapor in them.

-- A "neon light" has neon in it.

-- A sodium street light has sodium vapor in it.

-- A "halogen" light has the vapor of one of the halogens in it. I don't know which one.

The halogens are chlorine, bromine, and iodine.

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15y ago

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