A-line: The classic light bulb shape that fits all standard light sockets. Bulb life: The number of hours a light bulb will last under normal conditions. Efficiency: The amount of light generated compared to the amount of energy consumed; or, specifically, lumens divided by watts. Fluorescent: A type of light bulb filled with mercury vapor that emits ultraviolet light when electricity passes through it. The inside of the bulb has a coating that turns the ultraviolet light into visible light. Halogen: A type of incandescent light bulb filled with a special gas that greatly increases the amount of light produced. Halogen bulbs create true, or neutral, light that is devoid of color. Incandescent: A type of light bulb that uses electricity to heat a filament to the point of glowing. This glowing filament produces the bulb's light. Lumens: The standard measure of light produced by a bulb. A 100-watt bulb produces about 1600 lumens. Watts: The standard unit of electrical power. A higher light bulb wattage means more energy is consumed, thus generating a brighter light.
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