From what I can see its all marketing crap to make their LEDs look good.
check this out, umols/watt at different heights above the canopy.
2.7 umol/j Lumatek ATS300w pro (310w cover a 1m x 1m )
30cm (above canopy)622 / 310w = 2.00 umol/j
40cm (above canopy)572 / 310w = 1.84 umol/j
50cm (above canopy)524 /310w = 1.69 umol/j
100cm (above canopy)401.80/ 310w = 1.29 umol/j
50cm above the canopy looks good so that's 1.69 umol/j not 2.7 umol/j at this height above the canopy
So at this height is it any better than a de HPS, I am not sure, are you?
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