Abstract
The indirect illumination system with diffuse reflection light-emitting diode (LED) is widely applied in various fields that require high illumination uniformity. On the basis of the Lambertian characteristic of LEDs and the ideal diffuse surface, a design method that features a multiple diffuse reflectance freeform surface is proposed and its related mathematical model is established in this paper. A nonlinear algebraic equation is solved to redistribute the energy emitted by the LED to a uniformity illuminated scene. The outline of the diffuse surface is obtained by solving equations numerically. With the use of the ray tracing software TracePro, simulation results show that the effect is generally the best and the uniformity and efficiency are significantly improved compared with other methods when the proportion between the radius of the target surface and the distance between the LED light source and the target surface is 1:4.
Highlights
Lighting and display are among the most important branches of technology at the beginning of the 21st century
With the use of the ray tracing software TracePro, simulation results show that the effect is generally the best and the uniformity and efficiency are significantly improved compared with other methods when the proportion between the radius of the target surface and the distance between the light-emitting diode (LED) light source and the target surface is 1:4
A model of a multiple diffuse reflectance freeform surface is established based on the design of diffuse reflectance freeform surface
Summary
Lighting and display are among the most important branches of technology at the beginning of the 21st century They have changed how people think about general lighting design and application and provided important solutions for energy saving and environmental protection today and in the future [1]–[7]. Energy wastefulness and the human factor problem in lighting such as light pollution, glare, and non-uniform illumination are typically observed [8], [9]. To solve these problems, finding an appropriate design for luminaires is one of the most important issues in modern lighting.
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