don't know how much good this info will do: I'm looking at a wavelength graph in the 'Deluxe Marijuana Growers Guide', by Mel Frank ... the graph is in 'nanometers', not K-values ... but, looking at it, plant photosynthesis is at a Low around 525-625 nanometers, and the chlorophyll synthesis has a Low around 475-625 nanometers ... all that jibberish on the graph, amounts to very low responses from the upper blue frequencies, to the orange spectrum, (pretty wide range), including blue, green, yellow, and orange ... if that is accurate, the full range of green lightwaves should be pretty much 'invisible' to the plant, a comment I have read before, in grow guides (but, those writers smoke pot, so take it with a grain of salt) ... too much thinking, I need another bowl :rastabong: