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Food grade white vinegar or apple cider vinegar for ph down.

Fwiw, I have five CXA/B's in a small grow cab (24" x 36" footprint). 100mm fans on arctic heat sinks for each COB. They run cool, and with moderate airflow keep the temp inside the cabinet within 8degF of ambient. I have three CXA's and two CXB's for a total of 250W nominal, all running at...