Originally Posted by PhilM
(just upgraded my tail lights from poofy 5w ones to 10w....hopefully itll cope with the extra volts lol)
No...they will just be slightly brighter for a breif period. You need some heavy duty bulbs 14v. On trucks you can get 28v 10w bulbs as opposed to 24v 5w bulb but I can't recall having seen any for cars.
Best to get a new reg at a bare minimum...