Do I Need A Resistor For A 12v LED?

Do LED reverse lights need resistors?


The reason you use LEDs is because they are low power draw and give off low heat.

This better for your car.

When you put resistors in you just put the heat and load right back into the circuit in a different spot..

Do LED lights need resistors?

LED lights are excellent when powered directly from the battery or in addition to an existing circuit; however, this is not the case when used to replace OEM tail-lights. … Load resistors are needed on indicator lights and, depending on the base vehicle, perhaps on tail, stop and reversing lights as well.

What happens if you don’t use a resistor with an LED?

When hooking up an LED, you are always supposed to use a current-limiting resistor to protect the LED from the full voltage. If you hook the LED up directly to the 5 volts without a resistor, the LED will be over-driven, it will be very bright for a while, and then it will burn out.

What size resistor should I use with an LED?

Basics: Picking Resistors for LEDsPower Supply VoltageLED ColorResistor (rounded)5 VBlue, Green, White, or UV68 Ω5 VRed, Yellow, or Yellow-Green150 Ω5 VRed, Yellow, or Yellow-Green56 Ω9 VRed, Yellow, or Yellow-Green75 Ω4 more rows•Aug 29, 2012

How do you light an LED with 12v?

Connect the positive terminal of the 12 volt power supply to one side of the resistor. Connect the other side of the resistor to the anode of the LED. Check the LED data sheet to identify the anode and cathode. The cathode is commonly the shorter lead and located nearest any flat side of the LED.

Why do LED lights need a resistor?

The simplest circuit to power an LED is a voltage source with a resistor and an LED in series. … The ballast resistor is used to limit the current through the LED and to prevent that it burns. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

How many LED load resistors do I need?

If the same circuit wire is feeding into the two bulbs on each side of the truck, you should only need one resistor on each side, in-line with the circuit before the bulb (for a total of two).

Do LED load resistors get hot?

The load resistor is holding back power and the result of holding that power back so it does not get to the LED lights is heat. … Much like a light bulb the resistor is going to become warm or hot to the point of being uncomfortable to touch.