To the OP. I doubt the Trion would wash out the MS that much but it wouldn't matter anyway. The helmet light is most useful for illuminating left and right as opposed to straight ahead. I have never heard that a helmet mounted light would mess with your depth perception. I do know people who ride with them on trails and the road with no complaints.

My helmet light (40 lumen Blackburn Flea) is only for lighting up my comp and maybe changing a flat in the dark.