Unfortunately the old watts per gallon do not apply to LED's. Every Led fixture is different in the intensity, quality of led, spread and optics. The best way to know how much Led's you require is using a Par metre and tailoring your tank to what you are trying to grow.
Not everyone has access to a par metre you may want to try checking the website of the company that sells the Led's you want to buy. The better companies will have recommendations to how many you will need depending on what you are growing and how deep your tank is.
I have found having a more than you need and dialing back the intensity is the best way to go, rather than buying only enough or worse too little.
I currently have my LED's dialed back to 60% but am running the T5's at full intensity. I have a hybrid fixture.
Last edited by Frogger; 10-23-2018 at 03:04 AM.
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