thunderjoe
First time out of the vault
Maby if you use T-51B, Regular, Outcast, Brotherhood, or Lyons Pride Power Armour you use the helment mounted flashlight(as well as the pipboy light) witch would be a stronger more directed beam than the pipboy light, but if you use Enclave or Tesla Power Armour then you can use nightvision because the Enclave would probably have thought nightvision would be superior to a flashlight mounted on your head.