I've been inside the light each 9x18 heatsink has cooling fins about 3\4" tall & about the same width apart my Johnson cx- uses the cxb 3070 cobs but although I've never had it open I strongly suspect it has Chinese drivers , heatsinks & fans it works well but the cobs are too close to each other , I was given the viper light & am running it for heat , not seeing any better growth than my 200w CLW ss-275 that I pulled out because my lights on temps were too low , really thankful for everyone who has responded I wish I would of built lights to begin with I'm sure I'll have multiple question's as this gets up to speed I'll post everything right here with pics