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Robertson So-called Preheat Ballast
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No no, it's rapid start, but it's labeled as preheat lol. Three of these ballasts were indeed preheat though. All the ballasts are from the 90s and some were NOS while some appeared used. This one was NOS and was in a combo fixture with a F8T5 preheat choke.
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I noticed the label is also on backwards.