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Add Resistor to LED Panel Light to Burn Off the Excess Voltage From:http://www.lgiled.com   Reporter:   Date:2013/9/26 20:36:30   Tags:led-panel-light-safe led-candelabra-bulbs 7w-led-downlight
LED provides low voltage lighting in confined spaces. LED lights, like led panel lights, when run from a voltage higher than its normal operating voltage, it is necessary to add a resistor to burn off the excess voltage and thus limit the current flowing through the LED.

Light emitting diodes are a way to provide low voltage lighting in confined spaces where the heat from conventional incandescent bulbs would be inappropriate. LEDs offer almost no electrical resistance and require a tiny operating current. Supplying excess voltage to an LED results in high currents that quickly burn out the LED. When an LED runs from a voltage higher than its normal operating voltage, you need a resistor to "burn off" the excess voltage and thus limit the current flowing through the LED. Before adding the resistors, you are advised to prepare things you will need, like calculator, emery paper, soldering iron, solder and so forth.

Step 1
Read the accompanying technical data sheet for the LED to find its forward voltage. As we all know that different lights will run at different voltages. Blue and white LED have a vf of four volts, and other led colors are usually around 2 volts.

Step 2
Calculate the excess voltage by deducting the LED's forward voltage from the power supply voltage.

Step 3
Establish the recommended current. This can be done by reading the technical data sheet of LED. The typical value can be different from 0.01 amps to 0.02 amps. Use resistance equals excess voltage divided by current to calculate the value for the resistor. The required resistor is 7/0.02 ohms, or 350 ohms, if the led has a current value of 0.02 amps and an excess voltage of 7 volts. Resistors can be available from any electrical component store or online shop. You can find it easily.

Step 4
Rub the wires on the resistor with emery paper to clean it. You are advised to melt a blob of solder on the tip of a low-wattage soldering iron. Rest the end of the positive leg of the LED on the solder blob. You should add the solder until it is coated and remove it from the iron.

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