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Compared with traditional aviation ground runway lights, such as halogen lamps with low optical efficiency and poor color rendering index, LED have superior performance and begins to replace the halogen lamps to become the main aviation ground lamps. For aviation ground midline light require yellow or green light, we can choose a type of green or yellow LED to substitute the halogen lamps to achieve...
In this study, a method based on the definition of illuminance was presented to design freeform lens for uniform illumination in direct-lit light emitting diode (LED) backlight with high distance-height ratio (DHR). The principle and algorithms of the design method were introduced and several design examples were presented and discussed. Compared with traditional hemispherical lens, the freeform lens...
In this study, we examined the robustness of point light source approximation in lens design for light-emitting diode (LED) packages by Monte Carlo ray-tracing simulations. We modeled three representative freeform lenses first, and then simulated the lighting performance while changing the lens-to-chip size ratio (LCR). It is found that with the decrease of LCR, the lighting performances of the three...
In this paper, we analyze the optical features of different LED packaging types in forward-lighting application. There are generally two packaging types: point source and line source. For the two different packaging types, we introduce several high-efficient supporting opticses in forward-lighting application.
In this study, we first analyse the requirements both in optical and thermal aspects in theory. With the results of theoretical analysis, we design the application specific light emitting diode (LED) packaging (ASLP) with optimized structural parameters and choose appropriate packaging materials. According to this design, several samples are made and tested. The test results show that the LED packaging...
Nonuniform illumination caused by extended source is one of the challenging points for high power Light-emitting diodes (LEDs) especially for LED array applications. A new design method to improve the uniformity of illuminance of extended source is presented. To obtain high uniformity at target plane, a feedback optimization method is introduced including target plane girds, light source girds and...
Based on the RGB synthesis technique, a novel colored pulse lasers photography is designed for high speed imaging. A high quality color image can be acquired by assembling the three channels of red, green, and blue images which are acquired from three cameras with three independent laser light sources.
Traditional LED packaging always adopts hemisphere lens, although which can ensure high light output efficiency, its light beam is of circular symmetry and non-uniformity. Therefore, LED by traditional packaging cannot be applied in lighting directly and bulky secondary lenses have to be used, which will make the traditional lighting companies difficult to switch to LED lighting and the lamps are...
High power white light emitting diodes (LEDs) have begun to play an important role in many illumination applications due to their excellent performance. In this paper, an effective freeform lens design method for extended light source was suggested briefly for the first time and two compact LED packaging freeform lenses, with the material of polycarbonate (PC) and silicone respectively, were designed...
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