A filament for a light bulb includes a tube and a filament material within the tube, wherein the filament material is configured to be in a liquid state while the light bulb is in use.

A filament for a light bulb includes a tube and a filament material within the tube, wherein the filament material is configured to be in a liquid state while the light bulb is in use.

A tungsten-halogen electromagnetic radiation source has a sealed transparent aluminum oxynitride envelope defining an interior volume. At least one optical element is integrally formed into the aluminum oxynitride envelope. A tungsten filament is located in the aluminum oxynitride envelope. A fill gas in the interior volume contains at least a gaseous halogen compound.

A tungsten-halogen electromagnetic radiation source has a sealed transparent aluminum oxynitride envelope defining an interior volume. At least one optical element is integrally formed into the aluminum oxynitride envelope. A tungsten filament is located in the aluminum oxynitride envelope. A fill gas in the interior volume contains at least a gaseous halogen compound.

A filament for a light bulb includes a tube and a filament material within the tube, wherein the filament material is configured to be in a liquid state while the light bulb is in use.

A filament for a light bulb includes a tube and a filament material within the tube, wherein the filament material is configured to be in a liquid state while the light bulb is in use.