Abstract
High power LED(Light Emitting Diode) can be applied to surgical operating lamp due to the improvement of power efficiency of the LED. Comparing with LED, the traditional surgical operating lamp using halogen light source has disadvantages such as bid size and low efficiency. Especially, portion of halogen lamp spectrum belong to infrared rays and it generate a lot of heat which worsens the patients’ condition. Although the efficiency of LED is high, the brightness of the single LED is still not enough to be used in surgical light, therefore, it’s necessary to utilize plenty of LEDs and each LED needs an optical component to guide rays of light to satisfy the illumination specifications of surgical light. We use Tailored Freeform Method to compute the path of rays to generate the profile of a optical device to obtain a single LED optical module with high light intensity, high light uniformity and narrow light angle. Several single LED are arranged in concentric circle to allocate light to make total brightness satisfy the requirement of the surgical light. As a result, we can obtain a surgical operating lamp using less LED than current surgical lamps but achieving the specifications of surgical operating lamp’s requirements, the standard requirements include maximum central illumination, light distribution, shadow dilution and so on.