09844114 is referenced by 3 patents and cites 140 patents.

Techniques are described to allow a low-cost light fixture to produce light with a relatively high color rendering index (CRI) across a range of color temperatures. A rectified AC voltage may be provided to multiple groups of light-emitting diodes (LEDs) having characteristics related to a range of color temperatures and a target CRI level. The multiple groups of LEDs may be controlled based on a received control signal, such that the combined groups of LEDs produce combined light having a produced color temperature within the range of color temperatures, and having a produced CRI level that is approximately the target CRI level. In some implementations, the received control signal is modified by a modification circuit, and the multiple groups of LEDs may be controlled based on the modified control signal.

Title
Color mixing for solid state lighting using direct AC drives
Application Number
15/373580
Publication Number
9844114 (B2)
Application Date
December 9, 2016
Publication Date
December 12, 2017
Inventor
Alejandro Lopez
Lake Zurich
IL, US
Feng Chen
Hoffman Estates
IL, US
Michael Z Gielniewski
Bartlett
IL, US
Towfiq Chowdhury
Lake Forest
IL, US
Agent
Kilpatrick Townsend & Stockton
Assignee
ALB IP HOLDING
GA, US
IPC
H05B 33/08
H05B 37/02
View Original Source