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Illumination device using pulse width modulation of a LED

  • US 6,028,694 A
  • Filed: 05/22/1998
  • Issued: 02/22/2000
  • Est. Priority Date: 05/22/1997
  • Status: Expired due to Fees
First Claim
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1. An illumination device including:

  • (a) a solid state light source for producing light;

    (b) a pulse modulation power control circuit for periodically activating the light source to produce light at a level above the light produced by a sustainable steady-state power level; and

    (c) a luminescent substance for producing illumination, where the luminescent substance produces illumination in response to light from the light source and further where the luminescent substance continues to produce illumination after the light source has stopped producing light;

    wherein the average light output of the light source is greater than the average light output obtainable from the light source at the sustainable steady-state power level.

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