(19)
(11) EP 2 523 534 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.08.2013 Bulletin 2013/34

(43) Date of publication A2:
14.11.2012 Bulletin 2012/46

(21) Application number: 12166091.4

(22) Date of filing: 28.04.2012
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 12.05.2011 US 201113106808
12.05.2011 US 201113106810

(71) Applicant: Ledengin, Inc.
Santa Jose, CA 95134 (US)

(72) Inventors:
  • Yan, Xiantao
    San Jose, CA 95134 (US)
  • Lee, Kachun
    San Jose, CA 95134 (US)
  • Mei, Zequn
    San Jose, CA 95134 (US)

(74) Representative: Barnfather, Karl Jon et al
Withers & Rogers LLP 4 More London Riverside
London SE1 2AU
London SE1 2AU (GB)

   


(54) Apparatus and methods for tuning of emitter with multiple leds to a single color bin


(57) Apparatus and methods are provided for tuning the color of an LED-based lamp (100) to a desired color or color temperature. The lamp (100) can include two or more independently addressable groups of LEDs associated with different colors or color temperatures. The color (or color temperature) of the output light is tuned by controllably dividing an input current among the groups of LEDs. An optimal division of the input current is determined based on a linear interpolation between measured values of color or color temperature produced by at least two different divisions of the input current. Tuning can be performed once, e.g., during manufacture, and the lamp (100) does not require active feedback components for maintaining color temperature.







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