![]() The filament needs to be protected from the air, so it is inside the bulb, and the air in the bulb is either removed (a vacuum) or more often, replaced with a noble gas that doesn't affect anything, like neon or argon. Eventually the filament gets so hot that it glows, producing light. The resistance of the filament heats the bulb. Electrical filaments are made up mostly of tungsten metal. The incandescent light bulb turns electricity into light by sending the electric current through a thin wire called a filament. A light bulb that produces more light and less heat is more efficient. Except for heat lamps, the heat is considered waste. Light bulbs convert electricity into light and heat. electric arc lamp, the earliest kind, now rare except in big searchlights.light-emitting diode - previously only used for low-power places, they are now able to be used as light bulbs in the house. ![]() Compact fluorescent lights (or CFLs) are now replacing incandescent light bulbs in the house
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