Lighting products

Lighting products

Industry: Lights & lighting

Add a new term

Contributors in Lighting products

Become a Contributors

Lighting products

Lumen maintenance

Lights & lighting; Lighting products

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.

Lumens

Lights & lighting; Lighting products

A measure of the luminous flux or quantity of light emitted by a source. For example, a dinner candle provides about 12 lumens. A 60-watt Soft White incandescent lamp provides about 840 lumens.

A 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 ...

Luminaire

Lights & lighting; Lighting products

A complete lighting unit consisting of a lamp (or lamps), ballast (or ballasts) as required together with the parts designed to distribute the light, position and protect the lamps and connect them ...

Luminaire efficiency

Lights & lighting; Lighting products

The ratio of total lumens emitted by a luminaire to those emitted by the lamp or lamps used in that luminaire.

Luminance

Lights & lighting; Lighting products

A measure of "surface brightness" when an observer is looking in the direction of the surface. It is measured in candelas per square metre (or per square foot) and was formerly referred to as ...

Lux (lx)

Lights & lighting; Lighting products

A unit of illuminance or light falling onto a surface. One lux is equal to one lumen per square meter. Ten lux approximately equals one footcandle. (See FOOTCANDLE)