I just replaced the same amount of T8 bulbs over my 72 with a Finnex Ray II. My old fixtures were the black dual T8 shop lights from Lowes. They had NO reflectors and, in fact, the inside was painted black.
The Ray II is quite a bit brighter than the 4 T8s were. I'm injecting CO2, so that isn't an issue (in fact, it's what I wanted).
Lowe was telling me that a FugeRay over my tank would give me a low light level. That might be something you want to look at? It's a little cheaper as well.