Okay, so I've done some research on the efficiency of water cooling vs forced air cooling and it seems to me that water cooling is the way to go. I understand active air cooling is usually effective but my decision to go water is based on two things, I already have a few high gph pumps and other equipment used to create a nice water cooling loop, and I want to come as close to the max luminous flux possible with a 1400ma driver, which requires a Tc of as close to 25c as possible, at as low a cost as possible. My plan is to mount my CXA3070 chips onto a one inch square aluminum tube with capped ends and intake/outtake barbs at either end. My feeling, backed by some research, is that with an increase in barb size I can increase water flow and boost cooling capabilities even though turbulence would be low in a tube. I understand that by using aluminum I limit my ability to use other more conductive metals such as copper in a radiator but this is mainly for proof of concept since I can't find anyone who actually tried it this way and copper tubing like that is prohibitively expensive at the moment if it can even be found. I will be building a 5 foot length with 5 cobs running off a Meanwell 240h 1400a to test this out within the next week once I can get to the metal shop for some tubing. Any advice in the meantime would be greatly appreciated. Thanks y'all!