What is Luminaire Efficiency?

A 13-watt compact fluorescent has comparable light output to a 60-watt incandescent bulb. An 18-watt compact fluorescent has comparable light output to a 75-watt incandescent bulb. Fluorescent bulbs operate cooler, use less energy, and last about 5 times longer.

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Power supply voltage required for proper operation of fluorescent or HID ballast.

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In general lighting calculations, the fraction of initial lamp lumens that reach the work plane is the Co-efficient.  The Co-efficiant is a function of luminaire efficiency, room surface reflectances, and room shape.

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Color Rendering is an international system used to rate a lamp's ability to render an objects color. The higher the CRI (based upon a 0-100 scale) the richer colors generally appear. CRI ratings of various lamps may be compared, but a numerical comparison is only valid if the lamps are close in color temperature. CRI differences among lamps are not usually significant (visible to the eye) unless the difference is more than 3-5 points.

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Usually refers to the screw base typically used in household incandescent lamps. There is also the medium bipin base commonly used in T12 and T8 fluorescent lamps.

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