If the airport has LVP in force it offers that service, but it doesn't require you to use it. If you are only CAT I approved and the RVRs are at or better than CAT I you can of course try an approach. Most airports switch to LVPs well before the CAT I minimum is reached. If LVP operation would forbid you from using CAT I minima, what would be the point if you can never reach it?