Quote Originally Posted by Weezard
Yellow light is not harmful, it is just less efficient.
well...the scientists who conducted the test found yellow and uv harmed the plant they were growing . does this damage occur in cannabis ?in the case of UV we can safely say YES but MJ counteracts or responds to UV in a way that many growers find beneficial. does yellow[600nm] cause a similar response in pot ? I don't know...maybe/maybe not but if someone could point me to a narrow band light source centered at 600nm i would be willing to run a trial to find out.I don't need mega watts just something to hang between 4 18" buds as a supplement.