In order to validate the spectrum model presented in Eq.(11),experimental and simulated spectra of LED R1 at 340 k junction temperature are shown in Fig.7. The measured spectrum at 300 k has been used as a reference spectrum. c,Yp,Yg,and T0 were determined from Table II. An excellent agreement between simulation and measurement with R2 exceeding 0.95 has been found.
Additionally,luminous flux and CIE color coordinates at 340 k have been calculated from the simulated spectra and compared with measured data for all LEDs in Table III.
The results in Table III confirm the good agreement between simulation and experiment for all packages under consideration.Except for LED R2,the deviation between simulated and measured luminous flux is smaller than 2.5/ and all CIE-u'v' color differences E=u+v remain significantly smaller than the typical radius of a three-step MacAdam ellipse (E=0.006). The larger deviations for device R2 might be due to a small bump in the spectrum close to 5*10 Hz. Such spectrum deficiencies are of course not incorporated into the model.