Back when the Sofirn HS21 first released, I was enamoured with just how much it had going for it - regulated output, a cool UI, loads of emitters…the only flaw seemed to be its parasitic drain from the IR sensors.
Some of the first fixes for this were quick and easy - just slapping some black tape over the IR sensors. After mulling over it for a while though, I stumbled across a perfect solution - those silicone caps you put on chair legs:
With the addition of this cap, the sensors are shrouded in darkness, minimizing parasitic drain. Additionally, the sensors and charging port are extra waterproof, and it’s now easier to adjust the tilt of the light from the side.
Searching for “rubber end cap” on AliExpress got me plenty of results, and the 23.7mm diameter cap was a perfectly snug fit. I ordered from this seller, but there are many others!