Eric Coughlin
Veteran
The OP also said he was filming in the exact same type of locations featured in the video I posted earlier in the thread. If he is, and he has similar temperatures to those I faced in the arctic, there's a decent chance those Brightcast LEDs will fail, particularly if they are just stuffed in a pocket while being transported. Personally, I think the OP should arrange a lift from the airport, forget walking with kit and choose a lighting set-up that is more robust and has more punch as it can get very bright with old that snow and a low sun up north.
Zylight F8 will handle the weather.
http://www.zylight.com/zylight-f8-100-led-fresnel-captures-extreme-mount-washington-weather/
https://vimeo.com/55522911