1. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Schematic of the circularly prescribed illumination problem. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

2. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Design flowchart of the circular free-form lens design method. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

3. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Schematic of light energy mapping between the light source and target. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

4. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Calculations of the points on the contour line C0 of a lens. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

5. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. The progress of construction of the novel free-form lens. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

6. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. (a) Material object and (b) numerical model of Cree ® XLamp ® XR-E LED. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

7. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Modeling algorithm for a LED model. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

8. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Simulation light distribution curve versus experimental measurement for the LED light source. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

9. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Simulation light distribution curve versus experimental measurement for the LED MR16 lamp existing on the market. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

10. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. (a) A TIR lens for LED MR16 lamp existing on the market. (b) The novel 90-deg LED MR16 lamp lens. (c) The novel 120-deg LED MR16 lamp lens. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

11. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Simulation illumination performance of different LED MR16 lenses on a test plane: (a) a TIR LED MR16 lamp lens; (b) the novel 90- deg MR16 lens; and (c) the novel 120-deg MR16 lens. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

12. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Relative illuminance distributions of different kinds of LED MR16 lenses. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677

13. Date of download: 6/21/2016 Copyright © 2016 SPIE. All rights reserved. Novel 14-deg MR16 lens and its simulation results. Figure Legend: From: Free-form lenses for high illumination quality light-emitting diode MR16 lamps Opt. Eng. 2009;48(12):123002-123002-7. doi:10.1117/1.3274677