19 Terms
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Lighting products
Industry: Lights & lighting
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Lighting products
Distance between legs
Lights & lighting; Lighting products
For U-shaped Fluorescent lamps, this measurement is the average distance between the inner walls of the legs.
Distance outside legs
Lights & lighting; Lighting products
For U-shaped Fluorescent lamps, this measurement is the average distance to the outside of each leg.
Eccentricity (maximum)
Lights & lighting; Lighting products
In High Intensity Discharge lamps the Bulb to Arc Angle is the angle off of centre between electrodes and bulb. The Bulb to Base Angle is the angle off of centre that the bulb is from the base.
Efficacy
Lights & lighting; Lighting products
A measurement of how effective the light source is in converting electrical energy to lumens of visible light. Expressed in lumens-per-watt (LPW) this measure gives more weight to the yellow region ...
Efficiency
Lights & lighting; Lighting products
The efficiency of a light source is simply the fraction of electrical energy converted to light, i.e. watts of visible light produced for each watt of electrical power with no concern about the ...
Electrical discharge
Lights & lighting; Lighting products
A condition under which a gas becomes electrically conducting and becomes capable of transmitting current, usually accompanied by the emission of visible and other radiation. An electric spark in air ...
Electrical testing laboratory (ETL)
Lights & lighting; Lighting products
Independent testing laboratory that performs ballast tests and certifies accuracy of performance data.
