Non-uniform diffuser to scatter light into uniform emission pattern

A lighting device comprising:

• a light source;
• a diffuser spaced from and in the light path of the light source;
• and
• a wavelength conversion element between the light source and the diffuser and spaced from the light source and the diffuser, wherein said diffuser is shaped such that there are different distances between said diffuser and said conversion material at different emission angles;
• wherein said diffuser comprises diffusing properties that vary across one or more areas of the diffuser based on the desired emission profile for the lighting device.

A lighting device comprising:

• a light source;
• a diffuser spaced from the light source, said diffuser comprising areas with different diffusing characteristics, said areas comprising scattering elements that comprise varying scattering properties based on the desired emission profile for the lighting device;
• and
• a wavelength conversion element between the light source and the diffuser and spaced from the light source and the diffuser.

A lamp, comprising:

• a solid state light source emitting in an emission pattern;
• and
• a diffuser to alter said light source emission pattern so that said lamp emits a emission pattern comprising greater uniformity than said light source emission pattern, said diffuser being shaped with a lateral area comprising a smaller radius of curvature than a top area of said diffuser,
• wherein said diffuser comprises varying scattering properties based on the desired emission profile for the lamp.

A lighting device comprising:

• a solid state light source;
• a diffuser spaced from and in the light path of the light source;
• and
• a wavelength conversion element between the light source and the diffuser and spaced from the light source and the diffuser, wherein said conversion element comprises varying scattering properties and said diffuser comprises varying scattering properties based on the desired emission profile for the lighting device, wherein said lighting device emits a more uniform pattern than would be emitted by said conversion element or said diffuser diffusing said light source light without the other.