I use a mix of 3k and 4k F562b's strips and 4k H inFlux_L06 strips. Very little stretch even on sativa dom plants. And frost is definitely produced heavier under leds than hps. Atleast in my case it is.
These were grown under that light.
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Then my other light I built is a mix of 2700k and 3000k.
Seems to yield just a tad more. But it's also a stronger light and bigger space. 120 more watts. And I have 2x2 more area.
Single rows are sammy f562b 3ks and the double row are sunboard 96 diode lm561c s6 2700k. Dont get me wrong it brings the frost really good. Also strain dependant. But I do like the H inFlux_L06 4k strips the best out of all of them.
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