I have a good idea why tek went to these... Look around for ballasts for multiple t5 lamps - except for 54w's the majority of ballasts are only capable of firing 2.
more ballasts = more weight = more parts to stock... Workhorse 7 will drive 4, wh8 will drive 5. And isn't limited by length/wattage of the lamp.
Whole reason I'm looking at these is I want to drive a total of 20 lamps; the need for 10 ballasts is ridiculous!
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