A couple of lumens difference in reflectivity do not justify the expense of mylar(s). You aren't talking about a 5 to 10% performance enhancement overall, it's 5% of the reflected light within a 3 foot arc under the light. (400w HPS) Perhaps a 1% (guestimate) difference overall. But bringing the Mylar 'walls' closer to the plants (and lights) can restrict airflow and trap heat. I'd grow in the middle of my growroom (not using walls at all) before adding an unnecessary expense that bends, folds, cracks, scratches, collects water stains, and has to be replaced on occation...to still be of minimal benefit.

IR: being an insulator, does Luminix retain heat?


Merry Christmas, everyone :thumbsup: