Fabrication of high-power white light emitting diode lamp

With GaN blue lightemitting diodes (LEDs), high-power white LEDs (W-LEDs) were packaged with yellow poly-silicate phosphor. In this paper, W-LEDs lamps were made by 24 pieces high-power W-LEDs in two different connectionways: 2-parallelwith 12-series, and 6-parallelwith 4-series. With a proper driving circuit for the high-power W-LEDs lamps, the I-V characteristics, current illumination characteristic, power, and efficiency of the two different connections were studied, the experiment result showed that 2-parallelwith 12-series W-LEDs lamp had better properties than that of the 6-parallelwith 4-series W-LEDs lamp. W-LEDs lamps also have advantages of low power consumption, high reliability and stability compared with high-pressure sodium lamp and fluorescent lamp.