According to the requirements of high light efficiency and low power consumption of light-emitting diode (LED), based on analyzing LED optical performances, chip on board (COB) technology is adopted. The luminous flux, luminous efficiency and color temperature of LED are analyzed under different electric current and lighting time. The elements influencing LED optical performances are researched, analyzed and tested. Results show that using two kinds of samples with color temperature closed to 3000 K, electric current increases from 500 mA to 900 mA, color temperature increases 1.685% and 2.626%, luminous flux also increases 68.532% and 84.625% with the increasing of the electric current, but optical efficiency decreases 13.535% and 9.971%. Under the same electric current condition, lighting times are 0~1 min, 0~5 min and 0~10 min, color temperature increases 0.537%, 1.209%, 2.384%, 0.369%, 1.104% and 2.943% respectively. Luminous flux decreases 1.474%, 4.855%, 7.493%, 2.073%, 3.859% and 7.793% respectively. Optical efficiency also decreases 2.527%, 4.617%, 6.671%, 2.171%, 4.903% and 7.579%. The experiments show that LED optical performances are directly influenced by electric current and lighting time.