4. Results and discussion
4.1. Thermal characteristics of LED arrays
The five LED arrays are at first supplied with respective rated
voltages on a continuous basis for 300 s without forced cooling.
Infrared pictures of heat sinks at the rear of each LED array are then
taken. Subsequently, a pulse voltage signal, at 3e5 times respective
Fig. 2. Illustrates typical dark and illuminated IeV curves of a solar cell. LED rated voltages, having 10 ms pulse duration and 1 s period, is