Using 18 x bridgelux bxre-40e2000-c-23 with 3 meanwell Hlg-240h-c1050b drivers. Six cobs in series per driver. Used 4 15 inch x 13inch diamond plate aluminum plates with 1.5x1.5 1/8in angle to connect the 4 plates to make a 3ftx3ft square. I have 4 cobs per plate with 2 on the center cross bar so I imagine I have more than enough aluminum to act as a heat sink. I am using thermal tape to stick the cobs to the aluminum and soldering 18ga solid stranded wire directly on to the solder pads. Problem I am having is that no matter how well I solder them or how hot of a soldering iron I am using once I power them on it last between 5-15 seconds before I get some smoke and my wires will desolder themselves and pop off. I've been soldering for 10 years and never had anything like this happen with any of my solder joints. It cools pretty instantly once it loses power so I can't get an accurate temp reading.