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Search Help > HID (High Intensity Discharge) Bulb/Base Types

Overview
Cross Reference Guide
Bulb & Base Shapes
Incandescent
Fluorescent
HID
Common Lighting Terms
Bulb Types: A bulb desingation consits of a letter(s) to indicate the approximate maximum diameter in eighths of an inch. Thus, an ED17 is an Ellipsoidal Shape, 17/8 of an inch or 2 1/8 inches in diameter.



Base Types: Lamps with screw bases have one lead-in wire soldered or welded to the center contact and the other soldered or welded to the upper rim of the base shell. Bases with ceramic bodies have internal leads welded to either silver plated contacts or external lead wires.

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