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The conductors are the two wires you see supporting the filament. The glass supporting all this is an insulator. The metal ring around the base and the very bottom of the bulb conduct the electricity into the bulb. The plastic between them is an insulator.

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In incandescent bulbs, the filament of the bulb is a conductor, but has a high resistance to the flow of current, causing it to heat up and glow.

In fluorescent bulbs, the gas in the tube resists the flow and is ionized. The ultraviolet photons that it gives off cause the inside of the tube (coated with phosphors) to glow.

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