These captured screens share typical HDR problem. New fix using LUT tables is on the way on github for testing. Or you can use the old trick with v4l2-ctl but the color reproduction is worse than new one. Effects or fixed colors within Hyperion dont use grabber but they dont use settings in the imageprocessor either. So it says only that your leds are working correctly (as hardware) but it doesn't say anything about image processing settings for them. Check settings below to reduce brightness.