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Abstract

The invention relates to a light source for generating light having a spectral emittance in at least a part of the range of 380 nm to 680 nm. The light has a spectral power distribution E(λ) as a function of the wave-length λ over a first range of 600 nm<=λ<=680 nm, a second range of 505 nm<=λ<=600 nm, and a third range of 380 nm<=λ<=505 nm. A first ratio of the integral power distribution over said first range to that of a range of 380 nm<=λ<=680 nm is given by the relation: Formula (I) wherein 0.65<=P_l<=0.95, A second ratio of the integral power distribution over said second range to that of a range of 380 nm<=λ<=680 nm is given by the relation: Formula (II) wherein P_m>=0.08, A third ratio of the integral power distribution over said third range to that of a range of 380 nm<=λ<=680 nm is given by the relation: Formula (III) wherein P_s>=0.03 or P_s>=0.015 if P_l>=0.75l A respective radiation emission peak in each of the first, second and third wavelength range has a full width half maximum (=FWHM) of at least 12 nm.

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First Claim