Patent ID: 6636003
Filing Date: 2003-10-21
Classification: F21Y,H01L,H05B,Y10S

Abstract:
A temperature adjustable LED arrangement comprising:at least one white LED; a first drive circuit operable to supply a first drive current to the at least one white LED such that a white light is output at a first intensity; at least one colored LED arranged such that a colored light is output from the at least one colored LED and combines with the white light to produce a resultant light having a color temperature; and a second drive circuit operable to supply a second drive current to the at least one colored LED such that the colored light is output at a second intensity, the second drive circuit being adjustable so as to adjust a level of the second drive current supplied so as to vary the color temperature of the resultant light; wherein the color temperature of the resultant light is adjustable between about 2500 to about 5000 degrees Kelvin.