2 Terms
Contributors in Lighting
Lighting
Lay-in-troffer
Construction; Lighting
A fluorescent fixture; usually a 2' x 4' fixture that sets or "lays" into a specific ceiling grid.
Very high output (VHO)
Construction; Lighting
A fluorescent lamp that operates at a "very high" current (1500 mA), producing more light output than a "high output" lamp (800 mA) or standard output lamp (430 mA).
Tungsten halogen lamp
Construction; Lighting
A gas-filled tungsten filament incandescent lamp with a lamp envelope made of quartz to withstand the high temperature. This lamp contains some halogens (namely iodine, chlorine, bromine, and ...
Thermal factor
Construction; Lighting
A factor used in lighting calculations that compensates for the change in light output of a fluorescent lamp due to a change in bulb wall temperature. It is applied when the lamp-ballast combination ...
Photocell
Construction; Lighting
A light sensing device used to control luminaires and dimmers in response to detected light levels.
High output (HO)
Construction; Lighting
A lamp or ballast designed to operate at higher currents (800 mA) and produce more light.
Low-voltage lamp
Construction; Lighting
A lamp ( typically compact halogen ( that provides both intensity and good colour rendition. Lamp operates at 12V and requires the use of a transformer. Popular lamps are MR11, MR16, and PAR36.
