They do, but their online build module lacks the 420 nm diodes which are fairly Important. A massive amount of photosynthetic absorption occurs there, as well as fluorescence Well Ty as I am serious about sps, I suppose it's not a terrible idea to buy one. Again. Sucks that it'll have to be new. I never see them for sale used. How do you calibrate them or are the factory calibrations pretty stable?So then its not a full "build your own light" option then? It would be nice if they let you customize all by yourself and then just place the order.