A new method is proposed to achieve high illuminance and luminance uniformity of
the road surface in LED road lighting. Based on the reflection properties of the
road surface, the illuminance and luminance are analyzed simultaneously with the
least-square method; meanwhile, energy efficiency and glare requirements are
considered. Through the analysis and calculations, the optimal light
distribution of a luminaire is obtained, and then a freeform lens with this
light distribution is designed. For a 2-lane C1 class road illuminated by LED
luminaires mounted with these lenses, the overall illuminance and luminance
uniformity on the road surface can reach over 0.9 and 0.85, respectively, and
the glare factors less than 10%.
© 2013 Optical Society of America
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