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Lights & lighting
Any device used for illumination, either for practical use or deliberate aesthetic effect.
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Lights & lighting > Lighting products 
light loss factor
Lights & lighting; Lighting products
The product of all factors that contribute to lowering the illumination level including reflector degradation, dirt, lamp depreciation over time, voltage fluctuations, etc.
light pollution
Lights & lighting; Lighting products
Light that is directed to areas where it is not needed, and thereby interferes with some visual act. Light pollution directed or reflected into the sky creates a "dome" of wasted ...
light trespass (spill light)
Lights & lighting; Lighting products
Light that is not aimed properly or shielded effectively can spill out at into areas that don't want it: it can be directed towards drivers, pedestrians or neighbors. It is ...
lighting industry federation (LIF) code
Lights & lighting; Lighting products
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 ...
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.
Sub-categories
- Indoor lighting (47)
- Lighting accessories (13)
- Lighting bulbs & tubes (94)
- Lighting products (8932)
- Outdoor lighting (67)
- Portable lighting (9)