STL DIFFUSER In optics, a diffuser (also called a light diffuser or optical diffuser) is any material that diffuses or scatters light in some manner to transmit soft light. Diffused light can be easily obtained by reflecting light from a white surface, while more compact diffusers may use translucent material, including ground glass, teflon, opal glass, and greyed glass. - Wikipedia Most common LEDs provide light out the front (OTF) at a 20 degree angle. The STL Diffuser has been custom made for the 5mm LED to scatter the light and illuminate a wider area. Simply place the diffuser over the LED when ambient light is required. The STL Diffuser is made from GITD (glow in the dark) material so with a white, blue or UV LED it will continue to glow after use. £0.95 (2 PACK)