Abstract
Aithercomas Inc., Seoul 121-848, Korea(Received April 19, 2010; Revised May 13, 2010; Accepted May 23, 2010)Abstract: This paper has studied dissymmetrical light distribution design using the secondary optics in the simulation. fundamental Lambertian radiation distribution based on LED has been cut off by the secondary optics ,and the first surface slope of lens and second surface slope of total reflection area have been calculated through formula. PMMA (the index of refraction: 1.49361) which is material of lens has been selected. critical angle(42.02993°) between Air and PMMA has been calulated by snell's law ,and total reflection angle slope has been selected about 16.67° to occur the total reflection. when the first surface slope and the second surface slope has been set up, Rays of all total reflection area have generated the total reflection. finally, designed LED Module has been estimated by Korean Industrial Standards for LED safety street lighting. dissymmetrical light distribution have been analyzed with reached effect of road illuminance, and average road illuminance which are each 70.6 lx, 40.35 lx, and 25.88 lx have been satisfied with Korean Industrial Standards for LED safety street lighting.Keywords: LED, Secondary optics, Simulation design, LED safety luminaires
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