Optics Express · 2010 · 122 citations · 10 references
ArchitectureArchitectural EngineeringOptical MaterialsOpticsOptoelectronicsArtificial Lighting SystemsEnergy-efficient LightingLens SelectionLens SystemsLight SourcesLight-emitting DiodesFreeform Lens DesignLed LightingLens DesignLens Performance EvaluationMonte Carlo AnalysisMonte Carlo Ray Tracing
Low optical efficiency of light-emitting diode (LED) based headlamp is one of the most important issues to obstruct applications of LEDs in headlamp. An effective high-efficient LED headlamp freeform lens design method is introduced in this paper. A low-beam lens and a high-beam lens for LED headlamp are designed according to this method. Monte Carlo ray tracing simulation results demonstrate that the LED headlamp with these two lenses can fully comply with the ECE regulation without any other lens or reflector. Moreover, optical efficiencies of both these two lenses are more than 88% in theory.
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Free-form microlens for illumination applications
Liwei Sun, Shangzhong Jin, Songyuan Cen · Applied Optics · 2009 · 54 citations