GE Lamps Mercury Vapor Lamp, HID, HR100A38, 100 W, Mercury Vapor Lamp, E39 Mogul Screw, ED-23.5, 3850 Lumens Initial, 2695 Lumens Mean, 20000 hr Average Life, 15 CRI, 5700 K Color, Clear Lamp, Enclosed/Open Fixture, 2.937 in Dia x 7.5 in L

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• HID is generally the most efficient light source
• Better efficiency almost always means lower operating cost
• Most HID lamps have life ratings that are better than incandescent lamps and similar to fluorescent lamps
• An HID lamp produces high light output from a relatively compact source
• Like incandescent, it is a point light source, which allows for good optical control
• Phosphor coated deluxe lamps provide good color rendering