The ordinary LED lamp bead is a single chip with a voltage of 3.0V fixed in a plastic bracket cup, and then it is dispensed and packaged, that is, PLCC package. The LED filament process is usually to package 28 0.02W 1016 LED chips in series on a glass substrate with a length of 38mm and a diameter of 1.5mm, and then carry out the top fluorescent glue to achieve. The LED filament is driven by 10mA current, the voltage is 84V, the power is 0.84W, the luminous flux is 100lm, the luminous efficiency can reach 120lm\/W, if the red chip is matched, the color rendering index can reach more than 95. In addition, the LED filament has the characteristics of low current and high voltage, which effectively reduces the cost of LED heating and driver, and has outstanding advantages.