Can Fenix headlamps work in subzero or freezing temperatures?

Yes, Fenix headlamps can handle extreme temperatures. However, the main concern will be with the battery. You will want to use a headlamp that runs on CR123 batteries because they are more cold-resistant than 18650 batteries and will not slowly drain. Some suggestions for Fenix headlamps that run on CR123 batteries are:

Fenix HL50
Fenix HL55
Fenix HL60R
Fenix HP25R
Fenix HM50R
Fenix HP30R

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