Cree Gmbh

Mark McClear

Bernd P Keller

Nicholas William Medendorp, Jr

George R Brandes

Robert E Higley

Ronan P LeToquin

Wooh Jae Kim

Joshua J Markle

David T Emerson

Paul Thieken

Gregory S Bibee

Gregory S Blbee

David Todd Emerson

Joshua Markle

Bernard P Keller

The present invention, in one aspect, provides light emitting devices comprising LEDs, the light emitting devices, in some embodiments, having a simplified architecture for controlling the color of emitted light.

Color control of light emitting devices and applications thereof

A light emission package includes multiple colored solid state emitters each having a different non-white dominant wavelength in the visible range, and at least one lumiphor arranged to receive emissions from at least one other solid state emitter, with each emitter arranged on or adjacent to a common submount. The at least one other emitter and lumiphor may be arranged in combination to emit white light. Each emitter is independently controllable, permitting color and/or color temperature of a lighting device to be varied during operation of the device. At least one white emitter may be combined with red, green, and blue LEDs.

Lighting device

A multi-chip lighting emitting device (LED) lamp for providing white light includes a submount including first and second die mounting regions thereon. A first LED chip is mounted on the first die mounting region, and a second LED chip is mounted on the second die mounting region. The LED lamp is configured to emit light having a spectral distribution including at least four different color peaks to provide the white light. For example, a first conversion material may at least partially cover the first LED chip, and may be configured to absorb at least some of the light of the first color and re-emit light of a third color. In addition, a second conversion material may at least partially cover the first and/or second LED chips, and may be configured to absorb at least some of the light of the first and/or second colors and re-emit light of a fourth color. Related light fixtures and methods are also disclosed.

Multi-chip light emitting device lamps for providing high-CRI warm white light and light fixtures including the same

A light emitting device package assembly includes a light emitting device package body, and first, second and third white light emitting devices on the package body, each of the first, second and third white light emitting devices emits light when energized having a chromaticity that falls within a respective one of first, second and third non-overlapping chromaticity regions in a two dimensional chromaticity space. The first, second and third chromaticity regions are spaced apart in the two dimensional chromaticity space by respective regions having at least the size of a seven step MacAdam ellipse. Related solid state luminaires and methods are also disclosed.

Light emitting devices and systems having tunable chromaticity and methods of tuning the chromaticity of light emitting devices and systems

Light emitting devices and systems having tunable chromaticity

A multi-chip lighting emitting device (LED) lamp for providing white light includes a submount including first and second die mounting regions thereon. A first LED chip is mounted on the first die mounting region, and a second LED chip is mounted on the second die mounting region. The LED lamp is configured to emit light having a spectral distribution including at least four different color peaks to provide the white light. For example, a first conversion material may at least partially cover the first LED chip, and may be configured to absorb at least some of the light of the first color and re-emit light of a third color. In addition, a second conversion material may at least partially cover the first and/or second LED chips, and may be configured to absorb at least some of the light of the first and/or second colors and re-emit light of a fourth color. Related light fixtures and methods are also discussed.

An LED based emergency lighting system is described. Unlike a typical approach in which one lighting system provides normal ambient lighting and a second different system provides auxiliary emergency lighting, a common integrated system can be satisfactorily employed.

Growing community of inventors

Cary, NC, United States of America

Mark McClear