Development of high-power LED lighting luminaires using loop heat pipe
Journal
Journal of Light and Visual Environment
Journal Volume
32
Journal Issue
2
Pages
148-155
Date Issued
2008
Author(s)
Abstract
High-power LED should reject about 6 times of heat of the conventional lighting device and keep the LED junction temperature below 80°C to assure reliability and low light decay. In addition, no fan is allowed and the heat dissipation design should not interfere with the industrial design of lighting fixture and have a light weight. This thus creates an extreme thermal management problem. The present study has shown that, using a special heat dissipation technology (loop heat pipe), the high-power LED lighting luminaire with input power from 36 to 150W for outdoor and indoor applications can be achieved with light weight, among 0.96 to 1.57 kg per 1,000 lumen of net luminous flux output from the luminaire. The loop heat pipe uses a flexible connecting pipe as the condenser which can be wounded around the reflector of the luminaire to dissipate the heat to the ambient air by natural convection. For roadway or street lighting application, the present study shows that a better optical design of LED lamps can further result in power consumption reduction, based on the same illumination on road surface. The high-power LED luminaries developed in the present study have shown that the energy saving is > 50% in road lighting applications as compared to sodium light or >70% compared to mercury light.
Subjects
Energy saving; LED lighting; Loop heat pipe application; Optical design; Roadway lighting
SDGs
Other Subjects
Applications; Design; Heat pipes; Light weight structures; Mercury (metal); Optical design; Pipe; Product design; Roads and streets; Sodium; Street lighting; Energy saving; Heat dissipation; High power LED; Input powers; Junction temperatures; LED lamps; LED lighting; Light weighting; Loop heat pipe application; Power consumption reduction; Road lighting; Road surfaces; Roadway lighting; Sodium light; Lighting
Type
journal article