UV leds activating white phosphor is very efficient.
Even though the green in the spectrum is not used by the plants, overall electron to photosynthetic efficacy is very high for these white LEDs. ( yup I'm a dorky EE)
It's also easy to diagnose them under white light as opposed to the blue red lights where your eye can't make sense of what the plants look like.
Sorry OP, a bit off topic.
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