MIMedGrower
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Glass does block some light. Iirc 5% from my readings.
But 5% is nothing in my book. I KILL it with cmh. I'll never go back to hps or mh. EVER
The glass blocks most of your uv from those 315's. I am eagerly waiting for your new open reflector project to see if the results show this.
I am betting on a noticeable increase in trichomes and potency.