Importance

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Abstract

A lighting device includes: a light conversion unit including a light conversion element including a material containing an optically active element from lanthanoids, wherein:

the light conversion element includes a front side, a rear side, and a thickness (t),the light conversion element is set up for an irradiation on the front side with a primary light (I0), for a diffuse reflectance of the primary light (IREM), for a specular reflection of the primary light (IFRE), and for a diffuse emission of a secondary light (IEM) with an altered wavelength compared to the primary light, andthe light conversion unit has a specific diffuse reflectance SDR=t−1·IREM/(I0−IFRE), such that a luminous flux emitted by the light conversion unit at an irradiance limit of the light conversion unit with regard to a variation in the proportion of the optically active element is at most 4 mm−1 away from a maximum.

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First Claim