Patent ID: 7235792

Claim:
A controllable illumination device comprising: a reflective first cell having, a first enclosure having a central cavity, said first enclosure including a visible light transmissive outlet for transmitting visible light; a first phosphor material positioned in said first enclosure's central cavity responsive for producing visible light upon receipt of UV rays; a first substantially UV light source optically connected to said first phosphor material for causing said first phosphor material to produce visible light rays; a transmissive second cell having, a second enclosure having a central cavity, said second enclosure including a first visible light inlet connected to said first cell outlet for communicating visible light produced by said first phosphor material into said second cell, said second cell further including a visible light transmissive outlet for transmitting visible light; a second phosphor material positioned in said second enclosure's central cavity responsive for producing visible light upon receipt of UV rays; a second UV light source optically connected to said second phosphor material for causing said first phosphor material to produce visible light rays; and a controller connected to said first and second UV light sources for independently controlling the intensity of UV rays emitted from both the first and second UV light sources.