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Does anyone know what would happen? Does the ballast limit the power? If the T5 HO lamps were less expensive than T5 non-HO lamps, would it be ok to just use them in a non-HO luminaire?

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1 Answer 1

The HO bulbs require more power output to operate than regular bulbs... and that is why there is an HO ballast, to provide that extra power. You could put a regular bulb in an HO fixture, but not vice versa.

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HO always needs more power... Standards pull only what they need. As will all power supply type devices, the source can feed less load, but not more. –  Fiasco Labs Aug 9 '13 at 21:07

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