Many sea creatures get frightened by bright lights. They stay in dark shadows and crevices or only venture out in darkness. The Sea Dragon Red Filter uses a special formulated wavelength that has been tested to not frighten those elusive light-avoiding sea creatures. The filter easily snaps on/off underwater and works with all Sea Dragon Photo/Video/Dive Lights with 1200 or more lumens.; Many sea creatures get frightened by bright lights. They stay in dark shadows and crevices or only venture out in darkness. The Sea Dragon Red Filter uses a special formulated wavelength that has been tested to not frighten those elusive light-avoiding sea creatures. The filter easily snaps on/off underwater and works with all Sea Dragon Photo/Video/Dive Lights with 1200 or more lumens.