High Pressure Sodium (HPS) Lamp
A High Intensity Discharge light source in which the arc tube’s primary internal element is Sodium Vapor.
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High Intensity Discharge (HID) Lamp
An electric discharge lamp in which the light producing arc is stabilized. Examples of HID lamps include High Pressure Sodium, Metal Halide and Mercury Vapor.
HID
High Intensity Discharge
Hertz
1) A unit of frequency equal to one cycle per second. 2) In alternating current, the changing of the negative and positive poles.
Henry
The meter-kilogram-second unit of inductance, equal to the inductance of a circuit in which an electromotive force of one volt is produced by a current in the circuit which varies at the rate of one ampere per second.