Primos' bloodhunter hd uses a custom optical filter that reduces select colors in order to amplify blood.This light has state of the art blood trailing technology powered by intense 600 lumen cree xm leds.Its two power settings ,intense hd tracking and low illumination, makes blood visible in all types of terrain.The flat handle design is for comfort and carry.Type: FlashlightOutput: 600 LumensBulb Type: LEDProofs: Water ResistantColor: Black