Resources Contact Us Home
Method and apparatus for constant light output pulsed L.E.D. illumination

Image Number 8 for United States Patent #7393119.

An illumination source includes a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the illumination source is suitable for handheld portable operation. In some embodiments, the electrical circuit further includes a control circuit for driving the LEDs with electrical pulses at a frequency high enough that light produced has an appearance to a human user of being continuous rather than pulsed, the control circuit changing a pulse characteristic to adjust a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output. Some embodiments provide an illumination source including a housing including one or more LEDs; and a control circuit that selectively applies power from a source of electric power to the LEDs, thus controlling a light output color spectrum of the LEDs.

  Recently Added Patents
Audio signal shaping for playback by audio devices
Video poker game system and method
Electrode-membrane-frame assembly for fuel cell, polyelectrolyte fuel cell and manufacturing method therefor
Method and system for providing telephony services
Catalyst, production process therefor and use thereof
Needle head
Capacitor array layout arrangement for high matching methodology
  Randomly Featured Patents
Apparatus and methods for current-based models for characterization of electronic circuitry
Neural network based automatic limit prediction and avoidance system and method
Configurable low drop out regulator circuit
Phosphorescent iridium complex with non-conjugated cyclometalated ligands, synthetic method of preparing the same and phosphorescent organic light emitting diode thereof
Food preparation mould
Lithographic apparatus, device manufacturing method, and device manufactured thereby
Nosepiece for apparatus for installing fasteners
Universal mail wireless e-mail reader
Object conversion apparatus, object conversion method and program storing medium
Universal serial bus dongle device with wireless telephony transceiver and system for use therewith