Hi everyone I have a query that I hope somebody can answer I have a Vectra 2.2 TDi LS (04 plate ) and I wondered can I change the dipped headlight bulb for a H7 Single Xenon-Plus Bulb without doing any damage to the electrics as the handbook say the need a very high voltage to operate. Dealer says he only recomends that they change the bulbs Thanks in advance Olliebears