Personally, Ive never seen a T5 NO, or HO designation. Just T5. Also, never seen a T5 period outside of marine. All Home stuff is T8. Any fixtures I instal industry wise, are all T8 or T12. When your dealing with T12, theres NO, HO, and VHO. they alll are the same length bulbs, but the wattages are different. Only ever see one wattage rating for length of T5's
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Dan Pesonen
Umm, a tank or 5
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