Results and discussion
For the fabricated COB and COM packages, the chip junction temperature and thermal resistance of the 2 LED package types were measured. The parameters during the measurement were as shown in Table 2 where the input current was 1 A. For the COM package, the forward voltage was 12.13 V, the input power dissipation was 12.13 W, and the COM package chip junction temperature was 34.65 °C when the ambient temperature was 26.25 °C. A temperature difference of 8.4 °C between the ambient temperature and chip junction temperature was observed. For the COB package, the forward voltage was 11.79 V, the input power dissipation was 11.79 W, and the COB package chip junction temperature (Tj) was 45.28 °C when the ambient temperature was 25.83 °C. A temperature difference of 17.7 °C was observed between the ambient temperature and the chip junction temperature. With regard to the chip junction temperature of the 2 package types, it was observed that the COM package Tj=34.64 °C