A study on the yellow ring distribution of MR-16 WLED triplet lens module

Ching-Ching Yang; Hsin-Yi Tsai; Yi-Ju Chen; Kuo-Cheng Huang

doi:10.1117/12.2018938

22 June 2013 A study on the yellow ring distribution of MR-16 WLED triplet lens module

Ching-Ching Yang, Hsin-Yi Tsai, Yi-Ju Chen, Kuo-Cheng Huang

Proceedings Volume 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013); 876932 (2013) https://doi.org/10.1117/12.2018938
Event: International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 2013, Singapore, Singapore

Abstract

The yellow-ring (YR) is a chromatism phenomenon which is caused by the inhomogeneous phosphor layer of the whitelight LED (WLED) and can be observed from the projected WLED lightspot. In general, the lights emitted from a WLED will focus on the specific range to form a circular lightspot; in the meanwhile, the YR will appear on the periphery of this lightspot. In our previous study, the evaluation of YR phenomenon was graded by the YR index (YRI), which is the product of the yellow light intensity (Y) and total light intensity (I). Therein, the maximum value of YRI is a crucial optical parameter for determining the YR degree and a YR evaluation model is as the criterion for quality control of WLED. In this article, the YR distribution of MR-16 triplet lens module related to the distance (pitch) between two of three WLEDs will be discussed. Experimental results show that the YRI of triple lens WLED module is lower than one of single lens WLED module due to the overlapped effect of WLED lightspots. In addition, the YR degree of triplet lens WLED module will be lower if the pitch is longer, but the unintended dark-corner effect will appear when the pitch is enough longer.

Citation Download Citation

Ching-Ching Yang, Hsin-Yi Tsai, Yi-Ju Chen, and Kuo-Cheng Huang "A study on the yellow ring distribution of MR-16 WLED triplet lens module", Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 876932 (22 June 2013); https://doi.org/10.1117/12.2018938

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Light sources and illumination

Lamps

Light emitting diodes

Lens design

Reflectors

Halogens

Manufacturing

Show All Keywords

Keywords/Phrases

Search In:

Publication Years