Followed by the current, generally piranhas SMD LED lamp beads and bead current common is 20MA, but also a little better chip lamp beads can be done 25 to 30MA, the brightness will be better, but to a certain program will affect the light fades, 5050 SMD chip because it is three parallel package, which the current is 60MA. Now after understanding the current and voltage can follow the resistance R = U / I to forget, pay attention to the voltage here is the voltage difference, the general power supply is 12V. Ie, the resistance R = external supply voltage - voltage lamp beads / lamp beads is the current size of the resistor to be allocated. As 12V-3V / 0.02 * 3A = 150 Euro, which is the general approach with resistance. Size of the resistor is particularly important in the application of Chengdu led unit board, if you want to extend the service life of LED lamp beads, we must remember this point oh. LED light module with general resistance is mainly based on the LED lamp beads with the voltage and current to set. Now lamp beads used mainly piranhas lamp beads 5050 and 3528 SMD LED module and beads. They are basically the same voltage, white, blue, green are 3.0V-3.4V, red and yellow are 1.8V-2.4V. Linyi with resistance at the time led unit board, select the median bought voltage lamp beads, lamp beads buy if marked voltage is 3.0-3.2V, select voltage of 3.1V. Followed by the current, generally piranhas SMD LED lamp beads and bead current common is 20MA, but also a little better chip lamp beads can be done 25 to 30MA, the brightness will be better Hefei led unit board, but a certain program Effect of light failure, because it is three chip 5050 SMD parallel package, which the current is 60MA. Linyi led unit board _led cell plate _ Gao Jin photoelectric provided by Jinan Optoelectronics Technology Co., Ltd. Gao Jin. Jinan Gao Jin Optoelectronics Technology Co., Ltd. (www.gjlled.cn) strong, credible, in Jinan, Shandong liquid crystal device industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Gao Jin photoelectric and you hand into the brilliant, for a better future!