Work light has LEDs that require heatsink. Desired radiation pattern achieved by using optical components designed to produce beam or LEDs may have beams in different directions. Radiation pattern of LEDs may be changed by refractive-reflective optics or by convex lenses. Convex lenses may be hemispheres,...http://www.google.de/patents/US7553051?utm_source=gb-gplus-sharePatent US7553051 - LED work light
