1
Susan J Leong, John Kit: Power controls with photosensor for tube mounted LEDs with ballast. DeNovo Lighting L L C, February 17, 2009: US07490957 (114 worldwide citation)

A power saving device for a light emitting diode (LED) lamp mounted to an existing fixture for a fluorescent lamp having a ballast assembly and LEDs positioned within a tube and electrical power delivered from the ballast assembly to the LEDs. The LED lamp includes means for controlling the delivery ...


2
Kit John, Hsu Georgiana: Led lamps suitable for multiple power sources. Denovo Lighting L L C, quan xianqi, April 13, 2011: CN201010155537

LED driver circuits containing voltage reducing devices, voltage regulating devices, and voltage converting devices are disclosed as the main components to provide power to LEDs. The LED driver circuits are designed to work with a ballast, mains alternating current voltage, direct current voltage, a ...