@Mr. Grow It I have been recommended these lights with PPF of 1620, I have been told I would still need 4 plants under these, but the frame is quite big and will not be able to have 4 in a tent. I have read that 700 umol from a light is about right for a square meter so 4 plants but a review said that too much light can be damaging to the plant. Just need to advice if they are worth buying and using based on what conditions would need to be set for the room.
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Are you talking about the Lumatek Zeus 600w Pro? Once I know that I can answer better.