White technically aren't monos, but it honestly feel like the ones we are taking about should be considered monos. lol.
But yeah, a lot of the higher quality/better balanced spectrum mono panels/panels with white and red tend to act more like warm whites. They tend to look more pink than purple as well as far as the light they put off. I think it has to do with an intensity balance thing. That causes the plants to use different nutrients at different rates, whereas a more balanced spectrum the plants tend to take more up at at more similar rate.
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