Collimating lamp with well color mixing of red/green/blue LEDs

Ching Cherng Sun, Ivan Moreno, Yi Chien Lo, Bo Chun Chiu, Wei Ting Chien

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


A novel light luminaire is proposed and experimentally analyzed, which efficiently mixes and projects the tunable light from red, green and blue (RGB) light-emitting diodes (LEDs). Simultaneous light collimation and color mixing is a challenging task because most collimators separate colors, and most color mixers spread the light beam. Our method is simple and compact; it only uses a short light pipe, a thin diffuser, and a total internal reflection lens. We performed an experimental study to find a balance between optical efficiency and color uniformity by changing light recycling and color mixing.

Original languageEnglish
Pages (from-to)A75-A84
JournalOptics Express
Issue number101
StatePublished - 2 Jan 2012


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