Positive temperature coefficient light emitting diode light

1. An apparatus comprising:

a light source;

a substrate, wherein the light source is mounted to the substrate;

a temperature-based controller electrically and thermally coupled to the light source for controlling current supplied to the light source based on temperature to cause the light source to provide a relatively constant light output; and

an insulator proximate to the temperature-based controller to reduce the influence of ambient temperature on the temperature-based controller.

2. The apparatus of claim 1 , wherein the light source is powered by a non-linear electrical power having power fluctuations.

3. The apparatus of claim 1 , wherein the substrate is comprised of a thermally conductive material.

4. The apparatus of claim 1 , wherein change in temperature of the light source causes change in resistance of the temperature-based controller to control the current supplied to the light source.

5. The apparatus of claim 2 , wherein the light source is mounted to a first surface of the substrate and the temperature-based controller is mounted to a second surface of the substrate, wherein the second surface is opposite the first surface.

6. The apparatus of claim 5 , wherein the insulator is positioned proximate to a surface of the temperature-based controller not in thermal communication with the substrate.

7. The apparatus of claim 1 , further comprising a battery receiving region that supplies power to the light source.

8. The apparatus of claim 1 , wherein the temperature-based controller increases the current supplied to the light source in response to a decrease in the temperature and decreases the current supplied to the light source in response to an increase in the temperature.

9. An apparatus comprising:

light source;

a temperature-based controller electrically and thermally coupled to the light source for controlling current supplied to the light source based on temperature to cause the light source to provide a relatively constant light output; and

an insulator positioned proximate to the temperature-based controller that reduces the influence of ambient temperature on the temperature-based controller.

10. The apparatus of claim 9 , further comprising a substrate, wherein the light source is mounted to the substrate.

11. The apparatus of claim 9 , wherein change in temperature of the light source causes change in resistance of the temperature-based controller to control the current supplied to the light source.

12. The apparatus of claim 9 , wherein the insulator is positioned proximate to a surface of the temperature-based controller that is not in thermal communication with the light source.

13. The apparatus of claim 9 , further including a battery receiving region that receives a battery that provides electrical power for the light source.

14. The apparatus of claim 9 , wherein the light source receives power from an alternating current power source.

15. The apparatus of claim 9 , further comprising a lens that directs light generated by the light source.

16. The apparatus of claim 9 , wherein the light source comprises at least one LED.

17. The apparatus of claim 9 , wherein the temperature-based controller increases the current supplied to the light source in response to a decrease in the temperature and decreases the current supplied to the light source in response to an increase in the temperature.

18. A method for adjusting a forward current in a light device, comprising:

applying a forward current to a light source;

sensing a temperature of the light source by a temperature-based controller thermally coupled to the light source;

providing an insulator proximate the temperature-based controller to mitigate the impact of ambient temperature on the sensing by the temperature-based controller; and

reducing fluctuations in the forward current according to the sensed temperature to provide a relatively constant light output.

19. The method of claim 18 , wherein change in temperature of the light source causes change in resistance of the temperature-based controller to control the current supplied to the light source.

20. The method of claim 18 , wherein the temperature-based controller includes a positive temperature coefficient resistor.

21. The method of claim 18 , further comprising thermally coupling a surface of the temperature-based controller to the light source.

22. The method of claim 18 , wherein applying the forward current to the light source causes the light source to heat.