Choosing a resistor to work with an LED is fairly simple, but does require some knowledge of the LED and a small amount of maths. Some LEDs such as colour changing LEDs, flashing LEDs and 5V LEDs are designed to run off a 5V supply and therefore don't need a resistor.

In this case if you're changing 2x filament light bulbs you will need 2x load resistors). Video: Install a Load Resistor for LED Lights. Topics: Precautions: LED Resistor Wiring Diagrams: LED Load Resistors & LED Lights. LED Light Prices; Item: Location: Load Resistors: US Prices: AU Prices: UK Prices: CA Prices: IE Prices: FR Prices: LED

What type of circuit should I use? Is one better than the other…Series, Parallel, or Series/Parallel? The requirements of a lighting application often dictate what type of circuit can be used, but if given the choice, the most efficient way to run high power LEDs is using a series circuit with a constant current LED driver.

Be aware that if your battery drops very far below 12V, your LED string will probably shut off. 3.5V + 3.5V + 3.5V + Current*Rresistor = pretty close to 12V. simulate this circuit. You can also spread the power dissipation across two resistors in each string instead of just one. Each of these resistors will need to be half the resistance. The resistor would get 0.6 volts at 12 mA. So at 12 mA since the graph for brightness looks linear with respect to current, they'll be at 60% brightness.
The LED bulbs have a lower resistance that the flasher unit interprets as a "bulb out" problem. Should this occur, the solution is simple and readily available: obtain a set of easily installed resistors. The resistors fool the flasher unit by recreating the proper amount of resistance, and once installed, the turn signal bulbs flash at the
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    • do 12v leds need resistors