Is the application to see or be seen?See Doug's reviews in equipment.I like chemlights for blazing trail during night hikes.I can see my return path cheaply and safely with compass and chemlights posted periodically by time travelled and/or prominent trees,boulders etc.On a string they scare off feral dogs and coyotes(been there done that).However in the cold their illumination life is dramatically reduced.<br><br>