A fluorescent lamp has a coating on the interior surface of the glass envelope comprising an alkaline earth metal halophosphate phosphor and a quad-phosphor blend wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200 K on or near the Planckian...http://www.google.es/patents/US5838101?utm_source=gb-gplus-sharePatente US5838101 - Fluorescent lamp with improved CRI and brightness
