Lighting

Lighting

Industry: Construction

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Lighting

lamp current crest factor (LCCF)

Construction; Lighting

The peak lamp current divided by the RMS (average) lamp current. Lamp manufacturers require <1.7 for best lamp life. An LCCF of 1.414 is a perfect sine wave.

reflector

Construction; Lighting

The part of a light fixture that shrouds the lamps and redirects some light emitted from the lamp.

rapid start (RS)

Construction; Lighting

The most popular fluorescent lamp/ballast combination used today. This ballast quickly and efficiently preheats lamp cathodes to start the lamp. Uses a "bi-pin" base.

lux (LX)

Construction; Lighting

The metric unit of measure for illuminance of a surface. One lux is equal to one lumen per square meter. One lux equals 0.093 footcandles.

work plane

Construction; Lighting

The level at which work is done and at which illuminance is specified and measured. For office applications, this is typically a horizontal plane 30 inches above the floor (desk height).

footcandle (FC)

Construction; Lighting

The English unit of measurement of the illuminance (or light level) on a surface. One footcandle is equal to one lumen per square foot.

glare

Construction; Lighting

The effect of brightness or differences in brightness within the visual field sufficiently high to cause annoyance, discomfort or loss of visual performance.