well put it in short no plants see green light they only see huges of blue and red as u now blue red an green are primary colors so any colors other then does are created by mixing certain amounts of those colors to create new colors like purple orange yellow and so on putting a blue film over a hps or a red film over a mh might work but i'd assume it'd also filter out esential ultra violet rays and lumens output towards those plants now i havent worked with colors since highschool but im also guessing my statement is made as a educated hypothesis anyone else have any input or clarrifications ?