T4 tubes are the smallest of the fluorescent bulb sizes at only 4 eighths of an inch 0 5 in.
Circular fluorescent light bulbs size.
Standard t5s are smaller and are available in 6 9 12 and 21 inches.
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Standard t12s are available in 2ft 4ft 5ft 6ft and 8ft.
Their size is what makes t4 lights popular for under cabinet lighting purposes and accent lighting for displays or a staircase.
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They use a special 4 pin connector.
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Circline t9 fluorescent tube light bulb cool white 4100k 1 bulb.
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There is no industry standard for the length or wattage of t4 tube lights.
Those with a t9 tube diameter are available with outside diameters of 6 8 12 or 16.
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Fluorescent lamps in the form of circles are called circline lamps.
The length varies for each size of bulb standard t8s are available in 2ft 3ft 4ft 5ft and 6ft.
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Philips 40 watt 16 in.