LED work light
A light comprising an LED whose light intensity decreases as the angle from an axis of the LED increases, and a convex lens associated with the LED such that a beam width of the LED is concentrated by the lens into a narrower beam width, wherein the convex lens includes both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the beam width of the lens.
1. A light comprising:
a) an LED whose light intensity decreases as the angle from an axis of the LED increases, and
b) a convex lens associated with the LED such that a beam width of the LED is concentrated by the lens into a narrower beam width, wherein the convex lens includes both a convex surface and a concave surface, and the concave surface is curved more sharply in a concave manner towards its edge than towards its center such that light is entirely by refraction more evenly spread across the width of the beam exiting lens.
2. The work light of claim 1 further comprising:
a) a plurality of LEDs including the LED, and
b) a plurality of convex lenses including the convex lens,
wherein each LED produces a beam of light whose light intensity decreases as the angle from an axis of the LED increases,
wherein each lens is associated with a respective one of the LEDs such that a beam width of each LED is concentrated by its associated lens into a narrower beam width,
wherein the plurality of LEDs and lenses are arranged to produce a combined work light beam, and
wherein each lens has both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the area of the width of the beam exiting the lens than across a beam emitted by its associated LED.
3. The light of claim 1 further comprising a casing housing the LED and lens, wherein light emitting from the lens emits from the casing.
4. The light of claim 2 further comprising a casing housing the LEDs and lenses, wherein light emitting from the lenses emits from the casing.
5. The light of claim 4 further comprising a low voltage direct current power source to power the LEDs.
6. The light of claim 2 wherein the convex surface of each convex lens has a diameter, and the concave surface of each convex lens has a diameter smaller than that of the convex surface of its respective convex lens.
7. The light of claim 2 wherein the LEDs are white LEDs.
8. The light of claim 2 wherein each LED has a nominally lambertian radiation pattern.
9. The light of claim 8 wherein each lens achieves a beam width of no more than about 90 degrees.
10. The light of claim 9 wherein each lens achieves a beam width of at least about 90 degrees.
11. The light of claim 1 , wherein the convex lens is a concavo-convex lens and the convex surface is a convex forward surface of the lens and the concave surface is a concave rear surface of the lens, and wherein the light further comprises an axis through the LED, the convex forward surface and the concave rear surface, and the rear surface is between the forward surface and the LED along the axis.
12. The work light of claim 11 further comprising:
a) a plurality of LEDs including the LED, and
b) a plurality of convex lenses including the convex lens,
wherein each LED produces a beam of light whose light intensity decreases as the angle from an axis of the LED increases,
wherein each lens is associated with a respective one of the LEDs such that a beam width of each LED is concentrated by its associated lens into a narrower beam width,
wherein the plurality of LEDs and lenses are arranged to produce a combined work light beam, and
wherein each lens has both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the area of the width of the beam exiting the lens than across a beam emitted by its associated LED.
13. The light of claim 11 further comprising a casing housing the LED and lens, wherein light emitting from the lens emits from the casing.
14. The light of claim 12 further comprising a casing housing the LEDs and lenses, wherein light emitting from the lenses emits from the casing.
15. The light of claim 14 further comprising a low voltage direct current power source to power the LEDs.
16. The light of claim 12 wherein the convex surface of each convex lens has a diameter, and the concave surface of each convex lens has a diameter smaller than that of the convex surface of its respective convex lens.
17. The light of claim 12 wherein the LEDs are white LEDs.
18. The light of claim 12 wherein each LED has a nominally lambertian radiation pattern.
19. The light of claim 18 wherein each lens achieves a beam width of no more than about 90 degrees.
20. The light of claim 19 wherein each lens achieves a beam width of at least about 90 degrees.