Patent ID: 8227758

Claim:
Device for determining the light conversion power of a multitude of conversion elements for phosphor converted LEDs, the device comprising: a sample holder, a light source for illuminating the sample holder with a primary light, the sample holder being at least locally transparent for the primary light and configured for mounting the multitude of conversion elements, the conversion elements being configured to at least partially convert the primary light into a secondary light with a wavelength longer than the primary light, the sample holder further comprising a prevention means for preventing a light guiding of the secondary light from one mounted conversion element through the sample holder to another mounted conversion element, a detector element for measuring the intensities of the primary light transmitted through the conversion elements and of the secondary light created within the conversion element for each conversion element separately, the detector element comprising at least a first filter transparent either for primary light or for secondary light; and a calculation means for calculating the conversion power from the ratio between the intensities of the primary and secondary light measured by the detector element.