I put it in the t20 host and connected to h17a, basically linear 4mode, 5A max driver. It basically paints the whole room into photo red. Camera can't do it justice, it adapts, removes the excess red. Leds draw around 4.2A, but it could be due to limitations of the flashlight host, resistance of body, switch, spring etc... Nice quality. Happy. Seller is alright. Been buying several times here. Sometimes takes a few days to ship, I think he's soldering to substrate for every order. OK communication.