The optical design of a COB LED road lighting fixture model developed for M1 and M2 lighting class roads

Purpose: The purpose of this study; optical design and analysis of a COB LED road lighting fixture model suitable for M1 and M2 lighting class roads.Theory and Methods:One of the most important and critical parts of luminaire design is the optical design process. With a well -designed optical design, the rays emanating from the light source can be fine controlled. Optical systems are arranged in multiple layers to ensure sufficient brightness and luminous integrity in the event of a possible LED failure. In this study, a spherical concave-convex lens compatible with COB LED was designed to transmit the rays emitted from the light source to the desired area without loss and to keep the efficiency of the rays at the maximum level. In the LightTools program, the lens and the LED were combined at three different distances and three different luminaire models were developed. It was carried out the simulation studies on these models and light distribution curves were obtained. The light distribution curves which were obtained transferred to the lighting calculation program. Design verification studies have been carried out in the lighting calculation program. Results:In the study, the light distribution curves belonging to three different luminaire models were transferred to the DIALux lighting calculation program. Lighting parameters of light distribution curves were simulated according to M1 and M2 road conditions in the DIALux lighting calculator program and design verification studies were carried out. During the optimization phase, COB LED and lens distance of the luminaire model optimized which was developed considering compliance with M1 and M2 road lighting criteria. When the DIALux results of the study were examined, it was seen that the developed luminaire model within the scope of this study met the M1 and M2 road lighting criteria. As a result, with this study, the optical design and design verification of a completely original COB LED road lighting fixture model for the solution of a lighting problem needed in our country have been successfully completed.Conclusion:The luminaire designed by using a concave-convex spherical lens and a COB LED suitable for the lens, ensures that the rays emanating from the light source are transmitted to the desired area with minimal loss. In this way high energy efficient and original model has been developed that can better meet the lighting needs.