The different types of LEDs available

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­ Different types of LED's available;
With today’s range of vehicles, the amount of fitments of bulbs and LED’s is constantly growing.
Many people are under the impression that “one bulb fits all”. Unfortunately that is not the case. Bulbs come in various shapes and sizes and there are often many variants for all types of vehicles.
There are lots of people that simply don't know what bulb fits their vehicle, and they are confused between the different fittings and sizes.
Below you will find a guide that has been devised to help clear up all those questions, whether it is an issue with the fitment or that you are after a festoon (tube) style bulb and you are unsure which size is which.
If you ever find yourself having trouble matching your bulbs to the ones shown below, the easiest way to solve this is to check the bulb itself for reference numbers, these will often be named similar to those seen below.
Festoon Style Bulb;

They come in a variety of sizes and can be used on both the interior and exterior.
F2 - 31mm
F4 - 36mm
F5 - 38mm
F6 - 42mm

Wedge Style Bulb;

W5W / 501 / T10 - 10mm Wedge Base, 5 Watt, 12 Volt

Bayonet Style Bulb;

BA15S - Bayonet Base, 15mm Base, Single Contact Pin, Pins are opposite
BAU15S - Bayonet Base, 15mm Base, Single Contact Pin, Pins are offset
BAY15S - Bayonet Base, 15mm Base, Single Contact Pin, Pins are opposite, Pins are staggered
BA15D - Bayonet Base, 15mm Base, Dual Contact Pin, Pins are opposite
BAU15D - Bayonet Base, 15mm Base, Dual Contact Pin, Pins are offset
BAY15D - Bayonet Base, 15mm Base, Dual Contact Pin, Pins are opposite, Pins are staggered

There are 2 more different types of Bayonet Style Bulbs;
T4W / BA9S;

T4W - Bayonet Base, 9mm Base, Single Contact Pin, Pins are opposite

H6W / BAX9S;

H6W - Bayonet Base, 9mm Base, Single Contact Pin, Pins are offset

Polarity;
Often a common fault with LED's, is that they are simply the wrong way round. LED's work just like batteries, they only work one way. So the connectors must be touching the correct polarity or they just wont work. A simple turn of 180 degrees will fix the issue 9/10 times.
Canbus;
Another issue which is becoming more common, is the canbus error that appears on your dashboard. This is caused due to the LED using such a small amount of energy that your car actually thinks the bulb has blown. If you install some resistors, then this will resolve the issue instantly. Please Note - Resistors can only be used on the exterior of the car, and NOT the interior.
 
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