"As for testing LED's they do not measure like other sources in other words you can't use a quantum light meter to measure LED's for some reason. "

Actually, you do use a quantum light meter. The only real scientific measurement of light that EVER matters (lumens is for humans, not for plants) is the amount of photons that hit a given surface area per defined unit of time. We express this as umols per square meter per second (umol/m^2/s-1) and a quantum meter measures EXACTLY this.

There is no other way to quantify actual performance potential.

Get a real quantum meter made by Apogee or Li-Cor, since they have models specifically designed for testing photosynthetic photon flux density. Most other quantum meters are very poor-quality and cheaply designed for hobbyist aquarium builders, not gardeners. I've run through a bunch of them so I could get effective specifications on my panels listed.
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