The kessil h350 deep purple has the blue spectrum as well as the red, and the magenta only has majority red spectrum! The purple has the best of both. I see where your coming from. With autos I guess the deep purple is the best choice as far as veg and flower! I no you know what your saying lol. U just had it backwards! No worries. Deep purple is best choice. But for my 30" x 18" x 36" tent, a kessil h350 should do pretty well for only led! I only use led! No cfl no my no hps! To much heat and we have lots of flyovers around me cause of meth labs! Gotta be stealth son!