The light emitting intensity of light-emitting diode (LED) improved so much in these years that it is profitable enough to be used for design LED solid lighting. This LED light have been proved to be having many excellent virtues and was predicted to be having the possibility of leading the lighting industry into a new revolution. So in order to meet the design and optimization requirement of developing LED light

an effective method that is befitting in this work should be found out. In this article

the traditional LED’s light distribution is obtained through carrying out simulation of LED’s optical encapsulation structure by means of Monte Carlo method but not geometry optics method. The Monte Carlo LED simulation model is abstracted as dot light source

reflecting bowl

interface of epoxy resin and air. Light is treated as photons’ physical reactions with every possible part of whole LED’s optical encapsulation structure after emitting from the dot light source. These reactions include photons’ reflection and refraction on interface

absorption by epoxy resin material or wear down by interface of optical structure. Every stochastically emitted photo follows the physical optics and geometry optics rules and finally gets out of encapsulation and then is collected in a screen. When a large number of photons’ travel routes and locations of reaction with screen were determined

the light distribution pattern of correspondent LED’s optical encapsulation structure would be presented. And the average illumination intensity can be figured out through statistic method. Here

some kinds of traditional LED’s optical encapsulation structure were simulated using Monte Carlomethod. And experiments were performed using the correspondent LED’s optical encapsulation structure with the same conditions just like what were used in simulation. The Φ5

Φ12 dome-top and Φ5 plane-top LED tubes were simulated and experimentally measured for comparison. Some conclusions can be drawn that the simulation results fit the experimentation results well in the light distribution. This testified that Monte Carlo method is one of the effective tools for LED light’s optical design. There are some differences between simulation and experiment results in the patterns’ distribution scale because there are still some conditions’ differences just as characteristics of encapsulation materials and shapes of encapsulation structure. It is accurate enough for analyzing and finding out the relations between light distribution and correspondent optical structure and directing the right ways for designing more effective LED with new optical structure. The optimization and construction of random figures

the validation of simulation results

the comparison of different optical structure and the structure optimization were discussed in this article.