| Title |
A Study on the Optical System Design and Optical Properties for the Implementation of the Super Narrow Beam Angle of the LED Searchlight |
| Authors |
Kwang-Il Park ; Yong-Moon Yu |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.8.001 |
| Keywords |
LED searchlight; Parabolic reflector; Luminous intensity; Narrow beam angle; Optical design |
| Abstract |
In this paper, an optical system with ultra-narrow angle and high brightness, which is a key element of LED searchlights that are highly used in marine and military applications, was designed, and optical properties were evaluated by manufacturing a prototype LED searchlight optical engine. In order to realize the ultra-narrow angle and high brightness of the LED searchlight, the optical system is optimally designed with a parabolic reflector and an LED light source. For the LED light source, an LED source having a high luminous flux per area (lm/m2) was selected and positioned at the focus of the parabolic reflector. Through the light tracing simulation, it was found that the larger the diameter of the parabolic reflector, the higher the luminous intensity and narrow angle can be obtained. After the optimal design of the optical system, a prototype LED searchlight optical engine was prepared and optical properties were evaluated. As a measurement result of the optical properties of the final prototype, the beam angle was 1.5 ° and the luminous intensity was 402,210cd at the power consumption of 8.3W |