Comparison between the Full Spectrum Approximation Evaluation Method Based on Area Difference and the GFC Fitting Coefficient Calculation Method
Full spectrum lighting technology has become an important direction for the development of the semiconductor lighting industry.Full spectrum technology uses solar spectrum as the reference spectrum for comparison,how to evaluate the similarity between the lighting product spectrum and the reference spectrum is a key technical issue related to the quality evaluation of testing laboratories and the improvement of product performance in the industry.This article compares the spectral approximation method based on area difference with the fitting coefficient method(GFC method)and cosine similarity spectral fitting coefficient method(SCS method and GFC method are two expressions of Cauchy inequality)in three aspects:geometric figure,mathematical proof,and practical calculation examples.The comparison of actual calculation cases shows that the relative spectral approximation calculation method based on area difference has a completely linear relationship with relative area error and has clear geometric significance.However,compared with the GFC method in simulating spectral calculation results,there is a significant difference.The GFC method neither has clear geometric or physical significance,nor can it characterize the subtle differences between the two spectra.
full spectrum illuminationfull spectrum approximationarea difference