I have 320 watts of VHO's and 384 watts of PC's over my 125 totaling 704watts of light. If I were to "upgrade" to T5's, I could fit 6 80watt bulbs with individual reflectors putting me at 480 watts. Thats 3.84w/ gallon of T5 vs 5.6w/gallon of VHO and PC pre upgrade . . . This would solve my heat problems, and I would no longer need a chiller, and all I would need ballast wise would be is another workhorse7 (have 2 running the VHO's presently). I found a used retro someone is parting out, so 7 4-month old bulbs, reflectors, and endcaps would only cost me $200, but I would have to re-build my canopy (another $100 max). Is this worth diving into, or am I going to have an end result of more or less the same light output? I am wanting to have a nice LPS / softie reef and a squamosa clam long term. Thanks! ~Will.