18 watt 19-1/8" T4 Bi-Pin Base Cool White Fluorescent Light BulbGeneral TSL-T4-18CW 00418
$30.85
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Our Part #:
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QQ00418
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Manufacturer:
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General
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Manufacturer Code:
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TSL-T4-18CW
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Case Size:
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12
($370.20/Case)
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For an explanation of a lighting term, click on the 
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Energy Used:
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18 watts
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"Watts" is the term applied to the amount of energy required and used by a particular light bulb. It is an international system unit of power equal to one joule per second. Contrary to popular belief, the wattage of a bulb does not directly measure the brightness; the "lumens" of a light is what defines the actual light output.
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Bulb Type:
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T4
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The "Bulb Type" is typically a combination of the style of bulb as well as the width of the bulb. Usually, the first couple letters will indicate the type; "G" would indicate "Globe", "PAR" would indicate "Parabolic Reflector"... The numbers indicate the diameter of the light bulb in eighths of an inch; a "G40" would be a "Globe" style that is "5 inches" in diameter.
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Base Type:
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Bi-Pin
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The "Base" of a light bulb is the part that either screws or snaps into a receptacle. Base Type terminology may indicate common descriptive words like "Medium" or "Candelabra", or may even contain numeric codes that signify size and variety, like "E26" or "2GX13".
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Length:
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19.1 inches
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This is sometimes referred to as MOL, or "Maximum Overall Length". For light bulbs, it measures the absolute length of a light bulb, from the top of the bulb to the bottom of the base and is typically expressed in inches. For light fixtures, it applies to the complete vertical length of the fixture, out of the package.
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