Yeah, I was one of my first mods 5 years ago when I purchaced the VX. I've had the malibu 18 watt bulbs in for about that long. The bulbs themselves last about two years.
I've never had any problems with them getting too hot or melting the housing.
I do agree with Zorak. I would closly monitor those 55 watt bulbs. If they don't melt anything, let us know. I might want to try them.
Peace.
Tom
012009