||The main objective of this thesis is to discuss the optical system for the interior lighting with different light sources. By using the designed light guide element and other optical elements turn the point light source like LED or the linear light source like CCFL into uniformity surface light source. Also we can adjust the color or the color temperature of the lamp by using the red, green, blue or yellow LEDs.|
In order to establish the whole system model, we use optical simulation software. The system model includes light guide element, light source and reflector. In order to promote the efficiency of the lamp, we could use the reflection film or the reflection coating to turn the light which leak out from the light guide element back. Light which emitting from the light source transmit in the light guide element by total internal reflection. Until light touch the micro-structure which is created on the top of light guide element, it could change the moving direction and emit from the light guide element.
The first step is designing the size and the density of the micro-structure which is created on the light guide element to control the uniformity. We first use the CCFLs to design the whole model, and then add LEDs into the model. Finally the uniformity of the system could reach 85%. And we could adjust the color rendering property of the system by changing the position of LEDs or the different types of LED. After the adjustment, the average color rendering index of the system could reach 93. Adjusting color and color temperature of the whole system by changing the ratio of each light source and the range of color temperature could be adjusted form 6500K to 2700K, and then we could discuss the color uniformity and the color rendering property of the system.
Finally, we design a lighting lamp with multiple light sources. We could use single light source as lighting. Also we could use both two light sources to change the color temperature of the lamp or adjust the color rendering property of the lamp. According to using different light sources with different colors or different arrangement of light sources, the color temperature which could be adjusted and the color rendering property would be different.
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