You are using a web browser we don't support. Please use the latest version of one of these browsers.
Replacement fluorescent bulb.
F15T12/CW = Fluorescent, 15 Watts, Tubular, 12 eighths inch diameter, Cool White (∼4100 K)
Note that in metric designations, T38 (38 mm diameter) is equivalent to T12 (12/8" [1-1/2"] diameter).
In fluorescent tubes, for a given diameter, length correlates with watts. The longer the tube, the more Watts, and the more light output.
Fluorescent tube dimensions provided can be nominal, and may vary slightly within standardized min/max specifications.