· Got Crabs?
While some sps can survive under pc's and vho's they usually do not thrive with them. Intensity is the key and while you can can get 20k color temps in pc and vhos it is nothing compared to the intensity of Metal halides. Stuff will usually look more colorful under 20k's however will not grow as fast. 10k's with actinics will not produce as a blue a color as a 20k bulb will.