Method and apparatus for an L.E.D. flashlight

1. A flashlight, comprising:

(a) a flashlight housing, the housing being suitable for at least one of receiving therein and mounting thereon at least one DC voltage source;
(b) a light-emitting diode (LED) housing connected to the flashlight housing, the LED housing comprising a first plurality of LED units that each emit light and have a reflector for collimating the emitted light forwardly therefrom generally along an optical axis of one of the plurality of LED units, the first plurality of LED units including at least seven individual LED units; and
? a first electrical circuit that selectively applies pulsed power from the DC voltage source to the LED units, wherein the pulses have a frequency high enough that light produced by the LED units has an appearance to a human user of being continuous rather than pulsed, and the pulses have at least one characteristic that is controlled by the first electrical circuit in order to maintain an average predetermined light output level of the LED units as a voltage on the DC voltage source varies;
wherein the flashlight is of such compact size and low weight as to be suitable for single-handed portable operation by a user, the flashlight further having a purpose of providing general-purpose illumination.
2. The flashlight of claim 1, wherein the LED optical axes of the first plurality of LED units are substantially parallel to one another.

3. The flashlight of claim 2, further comprising:

a second plurality of LED units that each emit light and have a reflector for collimating the emitted light forwardly therefrom generally along an LED optical axis, wherein the LED optical axes of the second plurality of LED units converge forwardly from the housing.
4. The flashlight of claim 1, wherein an optical spread angle of the first plurality of LED units are substantially equal to one another.

5. The flashlight of claim 4, further comprising:

a second plurality of LED units that each emit light and have a reflector for collimating the emitted light forwardly therefrom generally along an LED optical axis, wherein an optical spread angle of the second plurality of LED units are substantially equal to one another, and different than the optical spread angle of the first plurality of LED units.
6. The flashlight of claim 1, wherein the DC voltage source includes at least one battery cell.

7. The flashlight of claim 6, wherein

the LED units are connected in a parallel-series configuration with at least two LED units coupled in parallel to one another and in series with at least one other LED unit; and
the DC voltage source includes at least three battery cells connected in series.
8. The flashlight of claim 6, wherein the first electrical circuit further includes a control circuit for maintaining a predetermined light output level of the LED units as a charge on the battery cell varies.

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9. The flashlight of claim 8, wherein the control circuit maintains an average predetermined light output level of the LED units as the charge on the battery cell varies by increasing a pulse width to the LED units as the charge on the battery cell decreases.

10. The flashlight of claim 8, wherein the control circuit maintains an average predetermined light output level of the LED units by measuring a battery voltage and adjusting a pulse width to the LED units based on the measured voltage to maintain the average light output at the predetermined level.

11. The flashlight of claim 8, wherein the control circuit maintains an average predetermined light output level of the LED units by measuring an average light output and adjusting a pulse width to the LED units based o n the measured light output to maintain the measured average light output at the predetermined level.

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Designed & Supported By Bussiness to Bussiness