CaliWorthington
Well-Known Member
Last video I watched where a guy measured a reflector with PAR meter with and without glass, the difference was pretty slight actually. However, it is a good point you make. Perhaps I should use the other bulbs then.Seriously why would you want put another piece of glass between your lamp and the plants.
Protected Mastercolor cdm already have two envelopes around the arc tube, that's why they're rated for open fixture.
If you're gonna put another piece of glass between your plants and cdm at least make the it the cdm which aren't protected and only have one envelope around the arc tube.