Originally Posted by
Floyd R Turbo
The mixture of different colors should definitely be limited to 660 (deep red), 630 (red), 455 (royal blue), and 435 (violet blue). 660 and 435 are the Chlorophyll "A" band, and 660/455 are the "B" band. I recently stumbled upon one possible reason you want to focus on the "A" band: this light band is utilized the most by chlorophyll during midday when sunlight is the most intense, and the "B" spectrum is for when the light levels are lower, like during the morning and evening, when the earth's atmosphere reflects or filters out most of the "A" band. So as it turns out, "B" stands for "Backup" haha.