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Just pure red or a spectrum leaning towards redRed.
Is it connected to your tank?I grow it faster than anyone I've ever met -- My refugium is outdoors and using sunlight. The last 6 months it's been on a rampage and I'm able to harvest a 33g trashbag every 2-3 weeks.
Dave B
We have a lab we do for photosynthetic rate measured by accumulation of O2 gas in a closed beaker.If you can have them all I would say go that route. Plants in general (and in my experience cheato specifically) do best with a full spectrum light. It is of course generally has more reds/whites than we would do in a reef tank, but again full spectrum is ideal. We usually dont see the blues when looking at a grow light as they are drowned out by the other spectrums, but a good multi-purpose grow light is also going to have quite a bit of blue spectrum in it also.
We have a lab we do for photosynthetic rate measured by accumulation of O2 gas in a closed beaker.
Students compare p-synth rate by growing aquatic vegetation (I typically use Caulerpa) under blue, red, green, yellow, and full-spectrum lights.
Honestly, the only spectrum that doesn’t really drive much p-synth is green (obviously). All other colors do roughly the same, although full-spectrum typically does nominally more. Enough to make a difference? Probably not.