Quadrichromatic white solid state lamp with digital feedback

Arturas Zukauskas; Rimantas Vaicekauskas; Felikas Ivanauskas; Genadij Kurilcik; Zenius Bliznikas; Kestutis Breive; Jevgenij Krupic; Andrius Rupsys; Algirdas Novickovas; Pranciskus Vitta; Alvydas Navickas; Vytautas Raskauskas; Michael S. Shur; Remis Gaska

doi:10.1117/12.514079

26 January 2004 Quadrichromatic white solid state lamp with digital feedback

Arturas Zukauskas, Rimantas Vaicekauskas, Felikas Ivanauskas, Genadij Kurilcik, Zenius Bliznikas, Kestutis Breive, Jevgenij Krupic, Andrius Rupsys, Algirdas Novickovas, Pranciskus Vitta, Alvydas Navickas, Vytautas Raskauskas, Michael S. Shur, Remis Gaska

Author Affiliations +

Proceedings Volume 5187, Third International Conference on Solid State Lighting; (2004) https://doi.org/10.1117/12.514079
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

White light with high color rendering indices can be produced by additive color mixing of emissions from several light-emitting diodes (LEDs) having different primary colors. White Versatile Solid-State Lamps (VSSLs) with variable color temperature, constant-chromaticity dimming, and efficiency/color-rendering trade-off can be developed using pulse-width modulation (PWM) driving technique. However, such lamps exhibit chromaticity shifts caused by different temperature and aging coefficients of the optical output for primary LEDs of different colors. To overcome this drawback, we developed a polychromatic white solid-state lamp with an internal digital feedback. The lamp features a quadrichromatic (red-amber-green-blue) design based on commercially available high-power LEDs. The design is optimized to achieve high values of the general color rendering index (69 to 79 points) in the color-temperature range of 2856 to 6504 K. A computer-controlled driving circuit contains a pulse-width modulator and a photodiode-based meter. The software performs periodical measurement of the radiant flux from primary LEDs of each color and adjusts the widths of the driving pulses. These VSSLs with feedback found application in phototherapy of seasonal affective disorder (SAD).

Citation Download Citation

Arturas Zukauskas, Rimantas Vaicekauskas, Felikas Ivanauskas, Genadij Kurilcik, Zenius Bliznikas, Kestutis Breive, Jevgenij Krupic, Andrius Rupsys, Algirdas Novickovas, Pranciskus Vitta, Alvydas Navickas, Vytautas Raskauskas, Michael S. Shur, and Remis Gaska "Quadrichromatic white solid state lamp with digital feedback", Proc. SPIE 5187, Third International Conference on Solid State Lighting, (26 January 2004); https://doi.org/10.1117/12.514079

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