What are the Input Watts used for?

Reflection from a smooth, shiny surface, as opposed to diffuse reflection.

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A lamp resembling the color of daylight, typically with a color temperature of 5500 K to 6500K

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Resistance of the cathode in a Fluorescent lamp is measured "cold" before the lamp is turned on (Rc) or "hot" after the lamp is turned on (Rh). The ratio of the hot resistance to the cold resistance is also measured (Rh/Rc).

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The angular dimension of the cone of light from reflectorized lamps (such as R and PAR types) encompassing the central part of the beam out to the angle where the intensity is 10% of maximum.

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Both regular incandescent bulbs and halogen bulbs create light by heating a filament (made of tungsten) inside the bulb; the heat makes the filament white-hot, producing the light that you see. Usually, the bulb burns out when the filament wears out. The filament on a regular incandescent bulb wears out over time because the tungsten on the filament evaporates and is redeposited on the bulb's glass. (This is also why bulbs often appear darker when they burn out; what you're seeing is tungsten ...

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