High Illumination Efficiency Linear Light Source Using Light Emitting Diodes

Abstract

We propose a linear light source using light emitting diode (LED) and a light diffusion bar for linear illumination. In order to get high illumination efficiency, the following factors of the illumination system have been investigated: (1) the effect of the diffusion area, (2) the effect of the relative size of LED and the light diffusion bar. In conclusion, a bigger diffusion size will produce higher emitting efficiency, and a small relative size of emitting surface of LED and cross section of the light diffusion bar will also achieve higher emitting.

Hotspot Location Shift in the High-Power Phosphor-Converted White Light-Emitting Diode Packages

“…[1][2][3] Considered as a strong candidate for the next-generation light sources, high-power LEDs have been developed rapidly in recent years and widely used in our daily life such as vehicle headlamps, traffic lights, landscape lighting, and even indoor fixtures. [4][5][6][7][8][9][10][11] However, the increasing power results in high heat flux generated in high-power LED packages. [12][13][14] The corresponding high temperature has an obvious negative impact on the optical performance and reliability of LED packages.…”

Analysis of the far-field region of LEDs

“…These properties will lead to many applications. However, there are special challenges in the optical design of a system containing LEDs [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Care must be taken to use the simplest LED model that more accurately predicts the performance of the system [1][2][3][4][5].…”

“…In these applications is useful to know where farfield begins. In other applications the spatial radiation pattern of LED must be simulated as an extended source by using a precise model [9][10][11][12][13]. In such situations, it is useful to know within which distance range the extended source model must be used for accurate performance.…”