I did buy all the 1812's lol. If your happy with your results I'd go with half of what you have now with cobs. Not just any cobs these amazing Cree and citizen brand@BigSm0 I only seem to be able to get 1212s at what I class as a sensible price(did you buy all the 1812s in the world?). Will I be happy enough with them compared to a couple of (for example) ViparSpectra panels? Tent space is 120cmx 80cm x 180cm high. I've had a 400w HPS in there before, in a parabolic. How will the 1212s compare against the 400w? It was a dual spectrum bulb. I'm really keen to lower the heat and want to keep it as quiet as possible.