Do cold temperatures affect the Down Low Glow?

We have had some customers use our product for snow and ice biking in the northern states. The temperature does affect the performance, but only in the time it takes to warm up the light. Once it's warmed up, the low temperature is OK. Also, using a full battery is more important when the weather is cold. A battery that is less than half-charged may not be able to bring the lights to their 'superbright' state in cold weather.