The Weltool LF61Y is a yellow filter for the Weltool W4 LEP light. The use of this filter changes the beam of the light from white to yellow. The filter protector tightly attaches to the head of the torch giving it extra protection. The filter has a spring cover design which means you can quickly open it to change between white and yellow light. Designed for the Weltool W4 but will fit other torches that have an outer diameter of 60.5mm.