Halogen warning lights are incandescent bulbs that emit light through a heated filament, while LED (light-emitting diode) warning lights are semiconductor devices that emit light when an electric current passes through them. LED warning lights are more energy-efficient, last longer, and produce a brighter, more focused beam of light than halogen lights.

The shape and size of marker lights you need will depend on the specific application and the location on your vehicle where they will be mounted. Rectangular marker lights are often used for side and rear applications, while round marker lights are commonly used for front and rear applications. As for size, you'll want to choose marker lights that are large enough to be visible from a distance but not so large that they become obstructive or distracting.

Yes, automotive warning and marker lights are street legal in most jurisdictions. However, it's important to check the specific regulations in your area to ensure that the lights you choose meet the legal requirements. This includes factors such as the size, color, and placement of the lights.

Installing automotive warning and marker lights typically involves mounting the lights to the vehicle's body or frame using screws or bolts. You'll also need to connect the lights to the vehicle's electrical system so that they can be powered and activated. It's important to follow the manufacturer's instructions carefully during installation to ensure that the lights are properly secured and functioning correctly.