The Olight blue filter creates a soft blue light that provides a less disturbing light which is good for navigation and map reading. Hunters use the blue filter to track wounded game at night because blood stands out more distinctly against foliage when viewed under blue light. Uses a high quality TPU body construction that offers flexibility and durability, as well as chemical and abrasion resistance. Provides more light than other filter choices while still reducing light output for tactical applications. The lens features a top quality, anti-reflective coating on both sides for optimum light transmission. Includes lanyard loop for portable convenience.