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Lamp Guide: HID


High Intensity Discharge Base Type (Not Actual Size)


High Intensity Discharge Bulb Shapes (Not Actual Size)

The size and shape of a bulb is designated by a letter or letters followed
by a number. The letter indicates the shape of the bulb while the
number indicates the diameter of the bulb in eighths of an inch.
For example “T-7” indicates a tubular shaped bulb
having a diameter of 2 1/8 inches. The following illustrations
show some of the more popular bulb shapes and sizes.