Nowadays, Light-Emitting-Diodes (LEDs) are solid-state lighting sources that

play a very important role now and future. Many traditional light sources

are gradually being replaced by LEDs sources. In order to illuminate light

from the new LED source on the desired illumination, the secondary optics

have been used widely in LED illumination. Proper illumination can enhance

lighting efficiency, uniformity and be suitable for human feeling as well as

aesthetic factor. Moreover, an effective illumination can represent lower

energy consumption. Therefore, the improvement of illumination efficacy

plays important role in the secondary optics system. This book is to

investigate the effects of injection molding parameters on mechanical

properties and optical properties of PC/PMMA blends. Mechanical

properties can be first predicted by some models based on rules of mixture

and then verified by experiments. Optical properties are also designed and

confirmed by LED lens of injection molding. The ANOVA tables have been

finished for determining the significance of injection molding parameters.

Illumination testing of TIR lens made of PC/PMMA blends has been
proceeded.