- Branche: Energy
- Number of terms: 8202
- Number of blossaries: 3
- Company Profile:
American conglomerate currently ranked by Forbes as the world's largest company. GE has multifarious business interests including power generation and financial services.
The ratio of total lumens emitted by a luminaire to those emitted by the lamp or lamps used in that luminaire.
Industry:Lights & lighting
A measure of "surface brightness" when an observer is looking in the direction of the surface. It is measured in candelas per square meter (or per square foot) and was formerly referred to as "photometric brightness."
Industry:Lights & lighting
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)
Industry:Lights & lighting
The end-to-end measurement of a lamp, expressed in inches or millimeters.
Industry:Lights & lighting
The average light output of a lamp over its rated life. Based on the shape of the lumen depreciation curve, for fluorescent and metal halide lamps, mean lumens are measured at 40% of rated lamp life. For mercury, high-pressure sodium and incandescent lamps, mean lumen ratings refer to lumens at 50% of rated lamp life (See Lumen Maintenance).
Industry:Lights & lighting
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.
Industry:Lights & lighting
A high-intensity discharge light source operating at a relatively high pressure (about 1 atmosphere) and temperature in which most of the light is produced by radiation from excited mercury vapor. Phosphor coatings on some lamp types add additional light and improve color rendering.
Industry:Lights & lighting
Typically referring to nighttime outdoor lighting conditions, the region between PHOTOPIC and SCOTOPIC vision (See SCOTOPIC).
Industry:Lights & lighting
Case design used in both magnetic and electronic ballasts. These ballasts are grounded once they are mounted to the fixture. They meet all safety codes, some of which do not allow plastic in open plenum areas.
Industry:Lights & lighting
