Fig. 5

The extracted values for each LED based on the data in Fig.4 and the Equation 1 (m=2). The LEDs 1, 5, 8, and 11 have slightly different wavelength (shorter) than others and showed larger .

The extracted values for each LED based on the data in Fig.4 and the Equation 1 (m=2). The LEDs 1, 5, 8, and 11 have slightly different wavelength (shorter) than others and showed larger .