Lighting

Lighting

Industry: Construction

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Lighting

instant start

Construction; Lighting

A fluorescent circuit that ignites the lamp instantly with a very high starting voltage from the ballast. Instant start lamps have single-pin bases.

harmonic distortion

Construction; Lighting

A harmonic is a sinusoidal component of a periodic wave having a frequency that is a multiple of the fundamental frequency. Harmonic distortion from lighting equipment can interfere with other ...

lamp lumen depreciation factor (LLD)

A factor that represents the reduction of lumen output over time. The factor is commonly used as a multiplier to the initial lumen rating in illuminance calculations, which compensates for the lumen ...

candela distribution

Construction; Lighting

A curve, often on polar coordinates, illustrating the variation of luminous intensity of a lamp or luminaire in a plane through the light center.

relay

Construction; Lighting

A device that switches an electrical load on or off based on small changes in current or voltage. Examples: low voltage relay and solid state relay.

daylight compensation

Construction; Lighting

A dimming system controlled by a photocell that reduces the output of the lamps when daylight is present. As daylight levels increase, lamp intensity decreases. An energy-saving technique used in ...