Reducing lumen variability over a range of color temperatures of an output of tunable-white LED lighting devices

Patent metadata

Field	Value
Publication number	US-8928249-B2
Application number	US-201313972341-A
Country	US
Kind code	B2
Filing date	Aug 21, 2013
Priority date	Aug 25, 2011
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A system provides white light having a selectable spectral characteristic (e.g. a selectable color temperature, delta uv, and intensity) using a combination of sources (e.g. LEDs) emitting light of three, four, five, or six different characteristics, for example, one or more white LEDs, and one or more LEDs of each of three primary colors, plus cyan and royal blue. A controller maintains a desired spectral characteristic, e.g. for white light at a selected point on or within a desired range of the black body curve. In addition, the controller provides selectable adjustments for values of the spectral characteristics, while maintaining substantially constant overall output intensity for the light output of White LEDs, thereby achieving Maximum Utilization.

First claim

What is claimed is:

1. A tunable lighting system comprising:
a white light emitting semiconductor device and a first non-white color light emitting semiconductor device;
a first driver for applying a first controllable drive current to the white light emitting semiconductor device and a separately controllable portion of the first drive current to the first non-white color light emitting semiconductor device;
a second non-white color light emitting semiconductor device, the se…

Assignees

• Abl Ip Holding Llc

Inventors

• Raj Rashmi K
• Rogers Jason W

Classifications

• H05B45/22

  Electricity · mapped topic

• H05B45/20 Primary

  Electricity · mapped topic

• H05B33/0869

  Electricity · mapped topic

• H05B33/0863 Primary

  Electricity · mapped topic