FYI guys, I've been using a Petzl Myo XP, an older model with a max light output of 150 lumens, and a regular long duration output of 85 lumens. I've found it perfectly adequate for night skiing, both XC trail skiing and yoyo turn earning in the backbush and poaching the local ski hill on dawn patrols. That being said, snow cover sure helps any ambient light...
Mtbing is another matter, my go to handlebar mounted light is rated at 450 lumens.. And it here are times I wish I had two, one to leave on as a spot beam, the other as a flood..
"there is great chaos under heaven, and the situation is excellent"
Disclaimer: Telemark Dave is a Hinterlandian.
He is not from New York State, and in fact, doesn't even ski there very often. He is also obsessive-compulsive about Voile Charger BC's.