Makes it much easier to see the difference in the two bulbs. They are nearly exact up until the red. The ATI seems more in the orange spectrum. I would imagine you could go too far with the KZ bulb easier than the ATI bulb. I'm going with a single KZ in my setup and the rest an even mix of coral+ and Blue+ I have decided. I'm also going to go with only 2 vhos instead of 4.