Is there any suitable fog bulbs that i can use in my 03 vectra sri fog lights which are dimmer than than the usual bulbs

Like what the new mini or galaxy uses I have also seen them in a London shape black taxi which was an R-Reg they look good, so there must be some which will do the job.

I like my new fog lights but i dont wanna drive around with the 55w bright bulbs in,thats a no no