Light emitting device

A light emitting device adapted for projecting a light beam onto a target surface, the light emitting device comprising:

• a light engine comprising a light source,
• a light mixing chamber comprising a light exit window,
• an optical component having a spherical shape with a curved light-receiving surface, and
• a diffuser,
• wherein the light source is arranged to, in operation, emit light towards the light exit window of the light mixing chamber,
• wherein the diffuser is provided at the light exit window of the light mixing chamber,
• wherein the optical component is provided adjacent to the diffuser, and
• wherein the shape of the diffuser is conformal to the curved light-receiving surface of the optical component and the diffuser is placed distance from the optical component coincident with a predetermined focal plane of the optical component;
• wherein the spherical shape is a sphere, and the predetermined focal plane is equal to:
• f=(R·n)/(2(n−1))
• where f is a focal length, R is a radius of the sphere, and n is a refractive index of the spherical shape.