What exactly is a kilowatt? (kW)

For Stage & Studio lamps, these are assigned by the Lighting Federation of London U.K. They ensure electrical and mechanical interchangeability of similarly coded lamps. LIF codes are divided into groups according to the primary application of the lamps.

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Radiant energy that can be sensed or seen by the human eye. Visible light is measured in lumens.

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A measure of how well a lamp maintains its light output over time. It may be expressed numerically or as a graph of light output vs. time.

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A fluorescent lamp, usually with a single pin at each end, approved to operate on instant start ballasts. The lamp is ignited by a high voltage without any filament heating.

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Lumens/WattsA ratio expressing the luminous efficacy of a light source. Typical lamp efficacies: Thomas Edison's first lamp - 1.4 lpW Incandescent lamps - 10-40 Halogen incandescent lamps - 20-45 Fluorescent lamps - 35-105 Mercury lamps - 50-60 Metal halide lamps - 60-120 High-pressure sodium lamps - 60-140 Note: The values above for discharge lamps do not include the effect of the ballasts, which must be used with those lamps. Taking ballast losses into account reduces "syste...

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