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No it’s fine to run it, the Diablo is actually designed as a mtb helmet light and the lumen output is quite high, it drops slightly with the red eye plugged in which is just a bit of the output diverted to the smart port.
I’ll see how it looks out in the dark, not actually ridden anywhere since I got it back as weather has been sub optimal.
Can't say I noticed any flicker. It blinks on/off when you plug in the RedEye and the front beam appears to be the same. Maybe the Diablo doesn't have enough grunt to run the rear light too?