Dear all, Let me first introduce myself. My name is Tim and I'm from the Netherlands. I have been reading bits and pieces about ATS systems and decided to go for a version with an airpump. The biggest issue I have so far is obtaining the proper leds from china. I have 2 e27 gooseneck fixtures and 2 types of led grow spots. 15w and 21w version. Unfortunately the 21w versions look more orange than red to me and I guess 620nm. Apart from thay I ordered the 15w seperately and also noticed a big difference here. One has more red so it seems.. because the glow is more violet color while the order tends to look more white (both are 4x red 1x blue mix and 660nm and 455nm).