When the light source passes through the reflector, it forms a beam of approximately parallel light. Due to the effect of the color filter, the beam is transformed into colored light. When the beam enters the optical fiber, colored light follows the path of the fiber to the predetermined location. Due to the loss of light in transit, light sources are generally very strong. The commonly used light source is around 150-250W. And in order to obtain an approximate parallel beam, the emission point should be as small as possible, similar to a point light source.