Secondary optical design of LED lamps with high CRI and adjustable CCT

Author

Keming Zeng ; Yujie Li ; Jin Chang ; Chunjin Hang ; Chunqing Wang

Author_Institution

State Key Lab. of Adv. Welding & Joining, Inst. of Technol., Harbin, China

fYear

2014

fDate

12-15 Aug. 2014

Firstpage

1472

Lastpage

1476

Abstract

A novel secondary optical design for LED lamps with high color rendering indices (CRI) and adjustable correlated color temperature (CCT) is proposed. RGB LED cells are assembled in a three dimensional manner together with a set of beam mixers. Perfect light mixing is resulted by optimizing the structural parameters of the reflectors and beam mixers. A supplement amber LED is used for light compensation. Illuminance and color of the luminaire can both be adjusted. CRI larger than 90 is maintained for a very wide temperature range from 4000K to 6500K. The largest Ra valued up to 93 is obtained at 6276K. Except for its outstanding optical characteristics, the present design is also featured by its advantages in simplifying the heat dissipation design. More LED cells could then be included in a lamp of relative small volume to get higher power.

Keywords

LED lamps; cooling; CCT; CRI; Illuminance; LED lamps; RGB LED cells; beam mixers; color rendering indices; correlated color temperature; heat dissipation design; light compensation; light mixing; luminaire color; optical characteristics; reflector structural parameters; secondary optical design; supplement amber LED; temperature 4000 K to 6500 K; Color; Light emitting diodes; Mixers; Optical design; Optical mixing; Optical reflection; Surface treatment; CCT; CRI; LED; secondary optical design;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Packaging Technology (ICEPT), 2014 15th International Conference on

Conference_Location

Chengdu

Type

conf

DOI

10.1109/ICEPT.2014.6922932

Filename

6922932