Omnidirectional LED based solid state lamp

摘要

A lighting apparatus includes a bilaterally symmetrical light engine comprising first and second light emitting diode (LED) devices or planar LED device arrays facing opposite directions, and an envelope including phosphor spaced apart from and surrounding the bilaterally symmetrical light engine. The phosphor is effective to convert light emitted by the light engine to emission light. The bilaterally symmetrical light engine may be configured to emit light having a bilaterally symmetrical intensity distribution that is uniform except at emission angles within 10° of the symmetry plane of the bilaterally symmetrical light engine. Each of the first and second LED devices or planar LED device arrays may comprise at least one hemispherically emitting LED device including an LED chip and an encapsulant encapsulating the LED chip and shaped to refract light emitted by the LED chip into a uniform distribution over a hemispherical solid angle.

主权项

1. An apparatus comprising:
a light engine comprising first and second light emitting diode (LED) devices or planar LED device arrays arranged to emit light in opposite directions, the light engine being bilaterally symmetric about a symmetry plane with the first LED device or planar LED device array and the second LED device or planar LED device array on opposite sides of the symmetry plane; and a surrounding spherical envelope including phosphor, the light engine disposed at the center of the surrounding spherical envelope, the phosphor being effective to convert light emitted by the light engine to emission light; wherein each of the first and second LED devices or planar LED device arrays is configured to emit light having a uniform intensity distribution within plus or minus 20% over all emission angles of a hemisphere except angles within 10° of the symmetry plane.