| 摘要 |
An illumination system has light source, an ellipsoidal reflector, an auxiliary reflector, an enclosure, and light tunnel. The combination of the ellipsoidal reflector and the auxiliary reflector is used to improve the light collecting efficiency. A reflective film is coated on the inner surface of the ellipsoidal reflector to reflect visible light but infrared and ultraviolet, and an absorptive film is coated on the inner surface of the enclosure to absorb infrared and ultraviolet then exhaust heat by the enclosure.
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