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A 40W T12 U-bend fluorescent tube from Philips, 22 7/16 inches long with legs spaced 6 inches apart on medium bi-pin bases. It gives a 6500K daylight-white light and is sold in a 12-pack, aimed at replacing burnt-out tubes in troffers and strip fixtures. Compared with 4100K or 3500K tubes, the 6500K color is bluer and brighter-looking, which suits workshops, garages and utility areas more than living rooms. It is a straight swap for the same size and base, not an LED retrofit, so it keeps the ballast and the higher running cost of fluorescent lighting.
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This Philips FB40DX/6 is a 40-watt T12 U-bend bulb with a medium bi-pin base. It measures 22 7/16 inches long, and the legs are spaced 6 inches apart.
The color temperature is 6500K. This listing is a pack of 12 bulbs.
