Hello! I'm an expert in automotive lighting and I'm here to help you understand what an H11 bulb is.

The H11 bulb is a type of halogen headlight bulb commonly used in many vehicles. It has a dual filament design, meaning it has two separate filaments inside - one for low beam and one for high beam. This allows the same bulb to be used for both functions.

The H11 bulb has a bayonet base, which means it has two pins that fit into a bayonet socket. It's important to make sure the bulb is properly seated in the socket to ensure a good electrical connection.

Now, let's talk about the modification you mentioned. Some vehicles may require a slight modification to fit an H11 bulb. This can involve trimming a small plastic tab on the bulb capsule to ensure a proper fit. It's important to be careful when making this modification to avoid damaging the bulb.

The electrical connection for the H11 bulb is the same as for other halogen bulbs like the 9005 and 9006. This means you can use the same wiring harness and connectors without any issues.

When installing an H11 bulb, it's important to follow the manufacturer's instructions carefully. Make sure the power is turned off before removing or installing the bulb to avoid any electrical hazards.

In summary, the H11 bulb is a versatile halogen headlight bulb that can be used for both low and high beam functions. With proper installation and care, it can provide excellent illumination for your vehicle's headlights.

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The h11 will not fit without modification. You have to cut about 1/8" off one of the plastic tabs on the bulb capsule. I believe I used wire nippers to do this. The modification is very similar to that needed to fit a 9005 bulb into a 9006 socket. The electrical connection is the same on both bulbs.read more >>