Winter is cold here in Russia and regular cables are getting stiff below -10C. By special request I have built a "winter special" dual lux-rc setup with XP-E narrow optics and XP-G oval optics using silicone cable for power.
The cable is SiHF 2x0.75 and it didn't fit in the cable opening of the handlebar mount. So I had to mill a separate channel for the remote switch cable and enlarge the cable opening. The connectors are XT60 - the customer will use a LiPo battery to power the lights.
The cable exit
A tee connector to power 2 lights from 1 battery
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Bike light for severe winter