sun blocker foil bubble..

Anyone use this..??? If so how does it help "manage heating problems"? By reflecting more light so it doesn't just turn into heat?? Probably a rediculous ? But I have a little to much heat and no reflectivity. The way its advertised(sound wise) I should b able to kill 2 birds with one stone..right?
Thanks

I'm using it but cant really give you any feedback as I'm only a week into my first grow.

What size space, light, n what r ur temps?

1'x1.5'x2.5'ish box 2x85w CFLs and x25w CFLs, 25-35 degrees

My area's a bit bigger then that.. and I use hid lights. I'm hopin it works as I belive I have sufficient ventilation. Now if I could get my temps down.. they jumped from 78 to 88-90 when I switched from mh to hps.

its good for insulation but not reflectivity. flat white indoor paint is much more reflective than any foil or mirror sheet.