just so you know its not the amount of lumens that makes the plant grow its the spectrum. t5 puts out the most useful light/lumen that a plant uses. That means that if you get a 4ft flouro that puts out y amount of spectrum that is useful for the plant then that means you can place like 5 plants in a line under a flouro as oppose to 5 cfl with x amount of lumens around the plants and only y amount of spectrum.

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Waffles.