<a href=showthread.php?s=&postid=9308927#post9308927 target=_blank>Originally posted</a> by jfl14609
but still they arent comparable to t-5s are they
I'm not going to know until I replace my NO ballasts with HO ballasts.
T6HO and T5HO lamps use the same ballast, so I can't imagine any electrical differences between the two. You may get on the T6 threads to find out what subtle differences exist between T5 and T6 lamps.
The determining factor may be the size of my T12 reflectors versus the size of T5 reflectors. The bigger, shinier and more parabolic reflector will win.
The obvious difference is that there are more choices in T5 lamps at this time. If you are buying today, buy T5. If you have an existing T8 or T12 fixture, buy T6HO and upgrade your ballasts. If you have VHO, buy T6-VHO.
In the future, as T8 and T12 lamps are replaced with pin-compatible T6 lamps, I can't imagine how T5 lamps are going to survive without a clear technological advantage. If you are an investor, buy T6 stock, not T5 stock.
Edit: I don't want to give anyone any stock advice. Maybe LEDs will sink both MH and fluorescent manufacturers.