Your question does not make any sense, but, you can use your headlights anytime you want, they are the most visible and best safety feature on your vehicle. That's why daytime running lights are standard on most GM vehicles and should be a law.
it's an illegal to use a different colored headlights.
Headlights should not be left on while the vehicle is not in use. If you are not driving, you will just drain your battery while having your headlights on.
Use your high-beam headlights at night whenever it is legal and safe.
You use low beam headlights when you're in a town or city in any location.
Use your high-beam headlights at night whenever it is legal and safe.
HID headlights refer to high definition headlights. These are headlights that use LED lightbulbs in them so drivers can see clearer and farther ahead in the dark.
use your low bean headlights
your headlights will burn out faster and could possibly blow a fuse, but you would go through headlights and a drastically increased rate if you use headlights when they are unneeded.
All the time
Headlights and wipers.
When the offender was led to the police car, he looked at the reporters like a deer in the headlights.
No, you should not use high-beam headlights at all in heavy fog.