After stopping hyperion with systemctl command and starting it again the leds are shining almost bright white and have fast flickering. I think it must be related on the usb grabber. Turning off and on the service again or switching "continues" in smoothing tab or switching usb grabbing off and on can solve the issue.
Im using a rpi 2b with hyperbian and hyperion 2.0.0-alpha.9 plus this hdmi grabber with loop from eBay.