This exact thing happened with my first Z. It is an easy mistake to make, I didn't know the only sure fire way to tell is the lack of a headlight height adjuster. It's all well and good saying you should have known, but the car was new to us all once... Personally I just dealt with it - got some Osram nightbreaker bulbs and jacked the adjusters on the lights themselves a full turn or so. They're not ace lights, mainly because they're so low, but I drove mine every day for 2.5 years and I'm not dead, so it's all good.
Given the issues I'm having with my xenons on my second Z I think I'd rather have my halogens back sometimes...
Given the issues I'm having with my xenons on my second Z I think I'd rather have my halogens back sometimes...