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Hello everyone,
Today, I would like to delve into a topic that has been frequently asked in various forums and discussions – What size resistor for LED turn signals? This question may seem simple at first glance, but it is a multifaceted issue that requires a deep understanding of electronics, specifically the relationship between LEDs, resistors, and the vehicle’s electrical system.
LED turn signals are increasingly popular due to their energy efficiency, longevity, and brightness. However, when replacing incandescent bulbs with LEDs, you may encounter a common problem known as hyper flashing. This is where the LED turn signals flash at a faster rate than intended, which can be both annoying and potentially dangerous as it may confuse other road users. This issue arises because LEDs draw less current than traditional bulbs, causing the vehicle’s flasher relay to misinterpret this as a burnt-out bulb.
This is where resistors come into play. A resistor is an electrical component that limits or regulates the flow of electrical current. By adding a resistor to the LED turn signal circuit, you can increase the current draw to mimic that of an incandescent bulb, thereby solving the hyper flashing issue.
Now, the million-dollar question – what size resistor do you need? The answer depends on the specifications of your LED and the original bulb.
Here’s a simple formula to calculate the required resistor value:
R = (Vsource – Vled) / Iled
Where:
– R is the resistance (in ohms)
– Vsource is the voltage of your vehicle’s electrical system (usually 12V)
– Vled is the voltage drop across the LED
– Iled is the current draw of the LED (in amperes)For instance, if you have an LED that operates at 2V and draws 20mA (0.02A), the resistor value would be (12V – 2V) / 0.02A = 500 ohms.
However, this is a theoretical value. In practice, it’s recommended to use a resistor with a slightly higher value to account for variations in the vehicle’s voltage and the LED’s specifications. A common choice is a 6-ohm, 50-watt resistor, which works well for most 12V systems.
Remember, the resistor will dissipate the excess power as heat, so it’s crucial to mount it on a heat-resistant surface away from any flammable materials.
In conclusion, determining the right resistor size for LED turn signals is not a one-size-fits-all answer. It requires a basic understanding of your vehicle’s electrical system and the specifications of the LED. I hope this post has shed some light on this topic and will assist you in your LED turn signal projects.
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