Methods and apparatus for generating and modulating illumination conditions

  • US 7,255,457 B2
  • Filed: 08/31/2004
  • Issued: 08/14/2007
  • Est. Priority Date: 11/18/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for generating essentially white light, comprising:

  • at least one first white LED characterized by a first spectrum having a first color temperature, the at least one first white LED including a first phosphor, the at least one first white LED generating at least one first wavelength that is converted by the first phosphor to provide the first spectrum; and

    at least one second white LED characterized by a second spectrum having a second color temperature, the at least one second white LED including a second phosphor, the at least one second white LED generating at least one second wavelength that is converted by the second phosphor to provide the second spectrum, wherein;

    the first color temperature differs from the second color temperature by at least 2200 degrees Kelvin.

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