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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 
rapid start lamp
Lights & lighting; Lighting products
A fluorescent lamp with two pins at each end connected to the filament. The filaments are heated by the ballast to aid in starting. Some rapid start lamps may be instant started ...
rated lamp life
Lights & lighting; Lighting products
For most lamp types, rated lamp life is the length of time of a statistically large sample between first use and the point when 50% of the lamps have died. It is possible to ...
reflectance
Lights & lighting; Lighting products
The ratio of light reflected from a surface to that incident upon it.
reflector lamp (R)
Lights & lighting; Lighting products
A light source with a built-in reflecting surface. Sometimes, the term is used to refer specifically to blown bulbs like the R and ER lamps; at other times, it includes all ...
room cavity ratio (RCR)
Lights & lighting; Lighting products
A shape factor (for a room, etc.) used in lighting calculations. RCR = 5H (L+W) / L x W, or, alternately; RCR = (2.5) Total Wall Area / Floor Area; Where H = height, L = length ...
scotopic
Lights & lighting; Lighting products
Vision where the rods of the retina are exclusively responsible for seeing, typically like the light levels in the countryside on a moonless, starlit night (See also PHOTOPIC, ...
scotopic/photopic (S/P) ratio
Lights & lighting; Lighting products
This measurement accounts for the fact that of the two light sensors in the retina, rods are more sensitive to blue light (scotopic vision) and cones to yellow light (photopic ...
Sub-categories
- Indoor lighting (47)
- Lighting accessories (13)
- Lighting bulbs & tubes (94)
- Lighting products (8932)
- Outdoor lighting (67)
- Portable lighting (9)