Method and apparatus for a variable intensity pulsed L.E.D. light
First Claim
1. A method of providing changable illumination of such compact size and low weight as to be suitable for single-handed portable operation by a user, comprising:
- providing one or more LEDs having a first characteristic color spectrum output and one or more LEDs having a second characteristic color spectrum output, wherein the first characteristic color spectrum output is different from the second characteristic color spectrum output;
selectively applying pulsed power from a DC voltage source to the LEDs, wherein the pulses are of high-enough frequency such that the human eye does not perceive the pulses; and
changing a pulse characteristic of the pulsed power in order to change a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output.
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Abstract
Improved method and apparatus for hand-held portable LED illumination. The 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 changing a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output, and that drives 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. Still another aspect provides 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.
140 Citations
20 Claims
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1. A method of providing changable illumination of such compact size and low weight as to be suitable for single-handed portable operation by a user, comprising:
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providing one or more LEDs having a first characteristic color spectrum output and one or more LEDs having a second characteristic color spectrum output, wherein the first characteristic color spectrum output is different from the second characteristic color spectrum output;
selectively applying pulsed power from a DC voltage source to the LEDs, wherein the pulses are of high-enough frequency such that the human eye does not perceive the pulses; and
changing a pulse characteristic of the pulsed power in order to change a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable pulsed LED illumination source of such compact size and low weight as to be suitable for single-handed portable operation by a user, comprising:
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one or more LEDs having a first characteristic color spectrum output;
one or more LEDs having a second characteristic color spectrum output, wherein the first characteristic color spectrum output different from the second characteristic color spectrum output; and
a control circuit that controls a pulse characteristic to the one or more LEDs having a first characteristic color spectrum output in order to change a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A battery-powered portable pulsed LED illumination source of such compact size and low weight as to be suitable for single-handed portable operation by a user, the source comprising:
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one or more LEDs having a first characteristic color spectrum output;
one or more LEDs having a second characteristic color spectrum output, wherein the first characteristic color spectrum output different from the second characteristic color spectrum output;
a switch; and
control means controlled by the switch and operatively coupled to the LEDs for changing a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output, wherein the control means drives the LEDs with electrical pulses at a frequency high enough that light produced by the LEDs has an appearance to a human user of being continuous rather than pulsed. - View Dependent Claims (20)
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Specification