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There are two types of colored bulbs. Some are just regular light bulbs with a semi-transparent color coating. A blue light bulb, for instance, will transmit blue light, absorbing out red. It will transmit smaller amounts of different colored light, but to your eye the light coming from the bulb is blue.Others actually emit light a a certain color, such as a yellow street light which is a sodium-vapor lamp. Overall the color you see is the color that is being emitted or transmitted.

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