If they are filament bulbs, if you do them in series; +/-/+/-/+/- etc, if one goes dead they all will. (X-mas lights syndrome) By doing them Parallel only the bulb that dies will go out.
They will be brighter as all the lamps will get 12v. the other way the current is 'diluted' by each lamp it passes through.
Ian M
They will be brighter as all the lamps will get 12v. the other way the current is 'diluted' by each lamp it passes through.
Ian M