Mine came in today, I ordered the 4k SST20 on my TA Lumen Tube I get about 1900 lumen in turbo at startup with an Efest IMR 14500 then drops hard in about 20-25 seconds to around 100 lumen which it seems to maintain. Absolutely amazing performance from such a small flashlight. The tint on both of mine is absolutely great with no hint of green.
Just a couple of quick comments. I would love for a stainless steel bezel to be released I have dropped mine a few times and it fell with the bezel striking the ground first each time. I predict this will become the standard EDC light for a lot of users here. Some will complain of the low amperage constant current, but this thing really packs a punch.
Pricey? Sure. But this thing is a hunk of plastic, really really thick, which gives it good performance with high powered flashlights. It even has o-rings.
No offense but this is really cheap to produce with injection molding. And plastic material costs are inexpensive, too. For $ 20 you get a full flashlight like Sofirn SC31 Pro.