15 November 2010 High illuminance light-emitting diode headlight for medical applications
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Abstract
High brightness light emitting diodes have been used to develop high illuminance headlight for medical applications. It provides various advantages such as high illuminance, long life time, reduced infra red light, extended operation time with battery and light weight. A 3 W LED was employed to achieve the high performance medical headlight. The optical design includes two lenses for high energy transmission and high illuminance. The LED headlight shows 42,000 lux with spot diameter of 80 mm at the distance of 300 mm. For comparison purpose, 5 W LED was also used to obtain the high illuminance headlight. However, the large divergence angle and large spot size of the 5 W LED limits the illuminance to 31,000 lux with increased burden on heat dissipation. The thermal images of the heat sinks indicate that the temperature of the headlight using a 3 W LED is below 50 degree C, which is suitable for medical applications.
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Ui-Hyung Lee, Jae-hun Jung, Seung Hyun Park, Gye Seon Lee, Young-Gu Ju, "High illuminance light-emitting diode headlight for medical applications", Proc. SPIE 7852, LED and Display Technologies, 78520F (15 November 2010); doi: 10.1117/12.870376; https://doi.org/10.1117/12.870376
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