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This is the same type of grease found in the orange packets (dielectric grease).
This grease is important not only for electrical connections, but to seal up any points where outside air may get into the light fixture. On some bulbs, such as the 9006 and 9007 sizes, there is an O-ring which you can coat with this grease to improve the seal and extend its life. Other bulbs might not have a seal on them, but all of them have to enter the fixture somehow, so there's always a spot to use this grease on.
Have you ever seen one of those headlights with water droplets on the inside? Had the bulbs been installed with this grease, they might have been dry.