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dude, any hardware store has electronic display co2 alarms. they display ppm, peak over 12 hours, CO (carbon monoxide), and one other setting i can't remember right now. i'm dizzy from walking into my grow shed... lol. anyway, just diable the audio alarm by cutting the three wires inside the...

hey. i've got a backyard shed, 6x8, two workshop lights with 2 sunlight tubes (replicates 92% of the spectrum, 2500 lumens, 40W each, sitting about 4-6 inches above my plants. i've got the walls covered with mylar, but boxes with foil just around these smaller cups until i expand the space...