SPACEMANS2
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<a href=showthread.php?s=&postid=10820884#post10820884 target=_blank>Originally posted</a> by HecticDialectic
Well he did say that the 60" bulb T5 did not have a reflector. That's a very big point to consider. A good reflector should add 30-40% light increase over no reflector. Overdrive them and you're looking at another 30% increase in output... So if that 60" bulb had a reflector and was being overdriven, it would have easily doubled the output of the VHO.
I'd take that to mean that a T5 is either going to be the same or higher in output to the same length VHO, but less wattage and heat.
if you go back to his post he compared a 5 foot lamp t-5 to a 3 foot t-12 lamp. Using a IC ballast on a t-5 to overdive will increase the output but then again if you use and IC ballast on a t12 will increase its output as well