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Or, is this just sort of a holdover from the MH/HPS switch?
>In our experience, the 13.4% blue light from CMH lamps would be adequate to grow all species without adding supplemental blue light (see spectral output graphs and summary table).
This is what Utah State had to say about the 3100K Philips, which puts out significantly more PAR than any other CMH lamp, including their own 4200K. Obviously, "adequate" doesn't mean ideal, and so perhaps the 4200K still manages to produce better vegetative growth, despite it's lower output? After all, cool white T5 is 24.1% blue, a larger gap than there is to the 4.9% HPS (no data for the 4200K).
I'm not asking if I really need two bulbs, I already have the 4200Ks, and I flower under DE HPS.
GrowersHouse has comparison data here, but it doesn't cover this.
>In our experience, the 13.4% blue light from CMH lamps would be adequate to grow all species without adding supplemental blue light (see spectral output graphs and summary table).
This is what Utah State had to say about the 3100K Philips, which puts out significantly more PAR than any other CMH lamp, including their own 4200K. Obviously, "adequate" doesn't mean ideal, and so perhaps the 4200K still manages to produce better vegetative growth, despite it's lower output? After all, cool white T5 is 24.1% blue, a larger gap than there is to the 4.9% HPS (no data for the 4200K).
I'm not asking if I really need two bulbs, I already have the 4200Ks, and I flower under DE HPS.
GrowersHouse has comparison data here, but it doesn't cover this.