Patent ID: 8337031

Claim:
A color-tunable illumination system comprising a light source, a first luminescent material, and shielding means, the light source emitting light of a first predefined color (B; UV), the first luminescent material being arranged for converting light of the first predefined color (B; UV) into light of a second predefined color (A; B; Y) different from the first predefined color (B; UV), and the shielding means being arranged for preventing at least part of the light emitted by the light source to impinge on the first luminescent material at least one of, the light source, the first luminescent material or the shielding means being changeable from a first situation to a second situation, in the first situation the light source, the first luminescent material and the shielding means being arranged for shielding at least part of the first luminescent material against impinging light of the first predefined color (B; UV) emitted by the light source, and in the second situation the light source, the first luminescent material and the shielding means being arranged for shielding less of the first luminescent material to the light of the first predefined color (B; UV) emitted by the light source compared to the first situation.