the striker is a 100watt bulb you don't need to change it, its the amps on the battery which determines how long the power lasts a 14amp will last about 4 hours depending how long you leave it on
thanks mate wont change it,got a 18 amp at the moment how long do you thick that will last me
18amp should last about 5 hours it all depends how long you leave it on for, it might be less, it might be a bit more.