If the lamp is incandescent, HPS or MH, then a color temperature something in that degrees Kelvin range is good, as that approaches the spectrum of sunlight plus the blue back-scatter from the sky. In the case of fluorescents and LEDs, however, it is a "correlated" or "corrected" color temperature, meaning "it looks like that to the human eye", and is not truly a reflection of the spectrum at all.
Generally speaking, white LEDs in the 3400-4500K range tend to be the most efficient, in terms of light flux per watt, and being as these are designed specifically for plants, I'm sure the spectrum is fine. Millions of pot growers would have Hydrofarm's head on a platter, otherwise.
The Philips commercial LED "production unit" lamps I have been using have a color temperature of about 2500K, but my plants love 'em, and I don't know how you'd even designate a temp for the red/blue LED strips that are so common.
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Hybrid Mode
