Nice review! I was looking at this one in another thread dedicated to it. Your review answers a few questions that were brought up there particularly of interest to me was the performance on a 10440. I’ve had two I3S and ran both on an Efest IMR and loved them. It too was amazingly bright on a 10440 but it wouldn’t fit protected cells with the stock spring. Does it have manual reverse polarity protection in the form of a little rubber donut? I suppose that’s one thing I would like to see added is a shot or two of the light disassembled to whatever degree you are comfortable with. A shot showing the inside at the driver end would have visually answered my last question. Still, lots of nice readings and numbers and I say thank you and as you’re fairly new here…welcome to BLF! 