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Archive for April 2012

What is a Lighting Ballast?

ballast

A lighting ballast has three primary functions: first, establish an electric arc through the lamp; second, limit current through the lamp after ignition; and third, compensate for variations in line voltage and ensure consistent lumen output. Learn the difference between traditional core-and-coil, and newer (and better) electronic ballasts …

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Ceramic Metal Halide Lighting Basics

CMH Street Lights in Chicago

Ceramic Metal Halide is relatively new light source, touted for being compact, efficient, and powerful. CMH is part of the high-intensity discharge (HID) lighting category, which offers the highest efficacy and longest life of any lighting type, and saves up to 90% of lighting energy when they replace incandescent lamps.

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Consider Photopic, Scotopic, Mesopic Vision before Specifying Lumen Requirements

Photopic Scotopic Mesopic vision

Commercial photometry is important for lighting installers and their clients in choosing the best locations to install fixtures as well as ensuring maximum efficiency of lighting systems. The science of measuring light, in terms of how the human eye perceives its brightness, is called photometry. …

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