I've been told relative blue light is used most for the plant in vegetative when it needs to grow tall and strong, and red-orange light helps grow fat buds and increase yields during flowering.... so heres my question what determines the color of the light? ... I mean can i cover a fluroscent light with red glass or film of some sort or something and change the wave-length? I mean it would cause the light to appear red? and that is how we determine color.... by wavelengths.. so if the light looks red it has the wavelengths of red spectrum? haha im sorry if this is confusing but its the simplest way I could put it.... just a thought I had...curious for an answer if possible..