Laser Journal, Volume. 29, Issue 2, 61(2008)
An optical design method of LED traffic-light
[1] [1] Stringfellow G B.High Bright LES[M].New York:Academic Press,1972,233-246.
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[in Chinese], [in Chinese]. An optical design method of LED traffic-light[J]. Laser Journal, 2008, 29(2): 61