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What is CFL mhl and hpmv lamps?
The abbreviations are CFL - Compact Fluorescent Lamp, MHL - Metal Halide Lamp, HPMV - High Pressure Mercury Vapor, and one more is HPS - High Pressure Sodium lamp
How high from the floor do you install an entry light?
Standard rule, top to the fixture same height as top to the door.
How many watts will a 150 watt High Pressure sodium light with a capacitor draw?
It will draw 150 watts. The capacitor is there only to increase the voltage enough to "excite" the free electrons in the gas to ignite.
How does ignitor in sodium vapour lamp work?
Similiar to a flourescent light. The ignitor provides a high voltage potential to excite the sodium gas within the bulb.
Why use 277v light fixtures instead of 110v light fixtures?
277v light fixtures are more efficient to operate and less expensive to install than a 110v fixture of identical wattage. 277v light fixtures are typically installed when 480V 3 Phase primary electric service supplies a commercial or industrial facility. 277v lighting circuits are single phase circuits using one of the 480v primary phases (A,B & C) to Neutral. The higher voltage allows more fixtures per circuit using smaller conductors and longer runs typically required in warehouse lighting applications. ( Amps = Watts/Volts: 400W/277V Fixture = 1.4 Amps, 400W/110V fixture = 3.6 Amps) With 480V 3 Phase primary service, 110V Single Phase power is created using a Step-down transformer. The voltage transformation process consumes power (kWh) and the 277V fixture will consume less kWh than a 110V fixture if identical wattage, especially in fixtures with ballasts such as fluorescent or High Intensity Discharge (HID), like Sodium, Metal Halide or Mercury Vapor.
