Optical characterization of different LED packages at various biasing current

This paper is about the optical studies on two types of warm-white light emitting diode (LED) packages (ceramic and pre-molded package) at the influences of biasing current. Spectroradiometer measurement set and application software were adopted in this study. Experiments were carried out with increasing biasing current from 300mA to 700mA, in 100mA steps, at the same ambient temperature of 25°C. Experimental results showed that luminous intensity of LED was increased and dominant wavelength was slightly shifted as the biasing current increases.