that is true to a certain degree....the hps is meant to mock the oranger more yellow light of the fall months signalling winter is coming and the plants finish flowering......but that is outdoors, that is nature, that's the sun man.....man never did it as good as mother nature bro....the sun still has the reds, the blues, the sun has it all.....the closest indoor growers get is expanded spectrum bulbs and mixing both metal halide and hps light in a single room, with light movers and shit. but mh is meant to be like summer, the bright sun of the summertime.