The T5s are $23. for 2,3, or 4' single fixture with the 6400k bulb. They are called "SunBlaster" n they have the ballast incorporated within the fixture. Each fixture comes with both a plugin wire with thumb switch and a daisy chain wire to use to plug several units together and control with one switch. yu can also get the 2700k bulb for like $11. The 4' bulb puts out around 5k lumens, 3' puts out over 3k lumens, and I think the 2' puts out a little over 2k lumens. They swear that these T5HO units put out 95 lumens per watt. the online store "Access Direct" has the best prices that I have found, and they have been pretty decent service wise.
Yeah I know about reflective surfaces. I read somewhere that mirrors are the worst for using with grow light as they reflect the worst part of the light spectrum and create hot spots. I am honestly not sure about this insulation, but it seems to do really good for keeping my IR signature down, which was my intention, along with just insulation value, but the reflective material is supposed to be like 95% reflective and it feels like mylar stretched over styrofoam. I got it at lowes.