Light diffusion (how light is spread) can significantly decrease dazzle and glare from the different surfaces and objects in a room. The more diffusely and evenly the light is spread the better dazzle and glare are prevented. Light diffusion can be defined as the ratio of the diffused reflected light to the totally reflected light. According to DIN 5036 measurements, ceiling tiles in light colours provide over 99% light diffusion, which means that practically all reflected light can be regarded as diffuse.