Patent ID: 8711355

Claim:
A performance evaluation device for evaluating one or more performance characteristics of a light-emitting device, comprising: a non-polymerizable carrier material having a substantially uniform thickness or flat configuration; and one or more photochromic materials on or within the carrier material, the one or more photochromic materials changing color upon illumination with light of one or more specified wavelengths, the performance evaluation device, when at least partially illuminated with a footprint of light from a light-emitting device, demonstrating one or more performance characteristics of the light-emitting device, wherein the one or more performance characteristics are selected from the group consisting of (i) size and shape of a footprint of light emitted by the light-emitting device, (ii) uniformity of a footprint of light emitted by the light-emitting device, (iii) presence of one or more specific wavelengths within a footprint of light emitted by the light-emitting device, (iv) location of one or more wavelengths within a footprint of light emitted by the light-emitting device, and (v) intensity of one or more wavelengths within a footprint of light emitted by the light-emitting device.