knight mare
Well-Known Member
Found this http://www.ledsmagazine.com/articles/2016/10/cree-ramps-performance-in-red-leds-for-horticultural-lighting-applications.html and it looks interesting especially this bit PAR (Photosynthetically Active Radiation) region from 400–700 nm, although other new horticultural metrics will include an even wider region from 280–800 nm or the plant biologically active radiation (PBAR) band as we will detail in a November/December feature article.
