An inspection light can be used on a vehicle for several reasons, including:

To inspect the engine bay: An inspection light provides bright and focused light that can be used to inspect the engine bay and other hard-to-reach areas of the vehicle.
To perform maintenance tasks: The bright light from an inspection light can be used to assist with tasks such as changing the oil, checking fluid levels, or locating leaks and other issues.
To diagnose problems: An inspection light can be used to help diagnose problems with the vehicle, such as a blown fuse, a loose wire, or other electrical issues.
To improve visibility: The bright light from an inspection light can improve visibility when working on a vehicle at night or in poorly-lit areas, making it easier to see what you are doing.

Overall, an inspection light is a useful tool for anyone who needs to inspect or work on their vehicle, providing bright and focused light that makes it easier to see what you are doing and get the job done more effectively.