Design and fabrication of a downlight luminaire with a dual frusto-conical reflector

Abstract

A design method and corresponding fabrication procedures are proposed for a dual frusto-conical reflector of a downlight luminaire. The profile of the dual frusto-conical reflector consists of two flat-slant reflective surfaces with slightly different slopes. The optimum dual frusto-conical reflector can be obtained with the proposed design method. The finished product of the dual frusto-conical reflector is fabricated by a 3D printer and followed by surface polishing and reflection paint spraying. The measurement results show that luminaires exhibited 70% optimum illuminance confined within an illumination area of 1.8 m 2 , and the optimum illumination intensity is at 252 lux. The optimum efficiency of the proposed luminaire can reach 158 lm/W for normal-white light-emitting diode (LED) and 119 lm/W for warm-white LED, respectively.

The Light Features and Bredigite Layout for Orthosilicate Phosphor in WLED Devices

“…Therefore, the industry has managed to a novel WLED form that offers desirable features of hue generation. Many novel phosphors have been created for WLED, such as oxide, oxyfluoride, nitride, oxynitride host latticework, etc (Hsin et al, 2021;Jain et al, 2020) subjected to non-ultraviolet light. While these phosphors have proved to be promising, we would still need further research for the task of eliminating certain problems to achieve strong performance, superior heat consistency, as well as improvement in hue features.…”