With a measured length of 45.25" on your bulb, this would be (what is referred to as) a 48" bulb. These measurements that these lamps are marketed with are referencing the fixture (or tank) width. The color temperature and spectral peaks would be the same on this bulb and what you have currently(6,700 kelvin). The disconnect would be on the wattage. The "F28" denotes wattage. The bulb that you have is a standard output T5 bulb, while these are High-Output (48" = 54 watts on high output). Standard output and high-output lamps are not interchangeable so you would need to purchase a standard output version.
answered 6 months ago
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