20 Terms
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Lighting products
Industry: Lights & lighting
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Lighting products
maximum overall length (M.O.L.)
Lights & lighting; Lighting products
The end-to-end measurement of a lamp, expressed in inches or millimeters.
mean lumens
Lights & lighting; Lighting products
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. ...
medium base
Lights & lighting; Lighting products
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.
mercury lamp
Lights & lighting; Lighting products
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. ...
mesopic
Lights & lighting; Lighting products
Typically referring to nighttime outdoor lighting conditions, the region between PHOTOPIC and SCOTOPIC vision (See SCOTOPIC).
metal cases
Lights & lighting; Lighting products
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 ...
metal halide lamp
Lights & lighting; Lighting products
A high intensity discharge light source in which the light is produced by the radiation from mercury, plus halides of metals such as sodium, scandium, indium and dysprosium. Some lamp types may also ...
