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F48T12 High Output Fluorescent Strip
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Here's a F48 high output fluorescent fixture used for cold weather operation. The ballast inside is a magnetic rapid start ballast that runs HO lamps from 4' total length to 14' total length and tends to instant start the lamps which are currently F48T12/HO/CW Philips Altos.
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mine always instant started until they were broken in. They blacken quickly at the ends.
Except they have the Shield logo and are from May 2003...