Customer Service: Monday - Friday, 8am-5pm, CST     800.838.0977     E-Mail     My Account 0 items   Fluorescents : Straight / Linear Fluorescent bulbs are typically indentified by their size, indicated by the number after "T" in the product description. This number represents the diameter of the bulb in eighths of an inch. For example, a T5 fluorescent would be 5/8" in diameter. T2 Straight Fluorescents 1/4 inch in diameter. T4 Straight Fluorescents 1/2 inch in diameter. T5 Straight Fluorescents 5/8 inch in diameter. T6 Straight Fluorescents 3/4 inch in diameter. T8 Straight Fluorescents 1 inch in diameter. T10 Straight Fluorescents 1-1/4 inches in diameter. T12 Straight Fluorescents 1-1/2 inches in diameter. T17 Straight Fluorescents 2-1/8 inches in diameter. Other Tube Guards Various Sizes of Tube Guards with Caps.

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