Thanks for the info CC

I think I understood but would like to clarify on temp. T8's run there best at 75 degree "air" temp? As in, if the room itself is 75 degrees, it would be at its highest efficiency and not have to do with the actual fixture itself? Just like if the air temp in the room was 90-95, T5's would run at their best?

That's a cool setup with the CFLs, looks like you have those 100w's with 'Y' adapters in an outlet strip? Are you not running those 65w - 300efficiency cfls due to cost or the drop in watt/lumen ratio?