US 7,598,859 B2
	Method and system for controlling lighting
Joseph Laski, Stoneham, Mass. (US); and Makarand H. Chipalkatti, Lexington, Mass. (US)
Assigned to Osram Sylvania Inc., Danvers, Mass. (US)
Filed on Aug. 03, 2005, as Appl. No. 11/161,449.
Claims priority of provisional application 60/601373, filed on Aug. 13, 2004.
Prior Publication US 2005/0237733 A1, Oct. 27, 2005
Int. Cl. G08B 1/08 (2006.01); H05B 37/02 (2006.01)

U.S. Cl. 340—539.3  [340/539.26; 315/149; 315/224; 315/312; 315/291]

12 Claims

1. A method of controlling lighting in a space illuminated by a light source, comprising sensing an occupancy level or activity within the space and adjusting a color rendering index (CRI) of light emitted by the light source in response to the sensed occupancy level or activity, wherein, the CRI is adjusted lower and, after the CRI is adjusted, the level of illumination within the space is substantially unchanged by the CRI adjustment and the light source uses less electrical power after the CRI adjustment.