Patent ID: 7572028

Claim:
An illumination system for a marketplace that comprises a consumer environment configured for the sale or purchase of goods or services, the system comprising: at least one LED-based light fixture including: at least one first white LED characterized by a first spectrum having a first color temperature, the at least one first white LED including a first phosphor, the at least one first white LED generating at least one first wavelength that is converted by the first phosphor to provide the first spectrum; and at least one second white LED characterized by a second spectrum having a second color temperature different than the first color temperature, the at least one second white LED including a second phosphor, the at least one second white LED generating at least one second wavelength that is converted by the second phosphor to provide the second spectrum, wherein the at least one LED-based light fixture is configured such that radiation comprising essentially white light based at least on the first spectrum and/or the second spectrum, when generated by the at least one LED-based light fixture, impinges on at least one article disposed within the consumer environment for sale to a purchaser; and at least one controller coupled to the at least one first white LED and the at least one second white LED and configured to control the at least one first white LED and the at least one second white LED so as to dynamically vary over time a third color temperature of the essentially white light.