This Ledlenser MT18 accessory is both a roll protector and a colour filter cap with pre-assembled colour filter.
It is available in four filter colours, which offer great versatility - red, yellow, green, blue. Simply insert the filter on the lamp, turn on and it's ready.
Red: reduces reflections and helps you maintain night vision away from the light beam.
Yellow: improves your sight in foggy conditions.
Green & Red: ideal for animal watching.
Blue: makes tracks more visible.