I don't know that ANY kind of light will keep a bear away. It might actually attract one that has learned to associate food with humans. We camp a lot in bear country and have never been bothered. But, we always keep our food locked up inside our truck and in the refrigerator in the trailer. Same goes for items used to prepare food, such as our propane barbecue, pots and pans, dishes, etc.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew