An illumination unit having at least one LED as light source, the LED emitting primary radiation in the range from 300 to 430 nm, this radiation being completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED, in which unit the conversion takes...http://www.google.ca/patents/US6674233?utm_source=gb-gplus-sharePatent US6674233 - Illumination unit having at least one LED as light source
