How bad would it be for the actual headlight housing to run with both the high beams and the low beams on at the same time. Also the bulbs are 100/80 and I am running with the upgrade harness. I'm not worried about the wires burning but actually the possibility of melting the housing. Its a 99 so the lens is plastic.

 

housing will handle it, no prob. Its resin...how do you plan on doing this?

 

I think that you'd be fine. THe housing is made of a plastic/ceramic composite and the lens is made of acrylic.