Headlight bulb life

[MTNBykah at aol.com]

I finally got my H4 euro's installed on my 4kq not too long ago, and I can finally see where I'm going.  They are a huge improvement.  The only thing is that the bulbs are only lasting about a month or so.  I have to buy the third set today because both bulbs went (at different times) yesterday.

The first set were no-name ones so I got Wagner super-something-or-others for about $10 each at the local parts store.  These were actually really good and the beam pattern was crisper than the first set.

The way these are wired, there is heavy gauge wire from the alt (fused) to a separate relay for each high & low beam triggered by the old wiring from the switch.  They are grounded with good size wire right to the core support.

Is there some issue with the way they are wired?  Or can I get better bulbs somewhere?  The old lights really sucked, but I used to scrounge used 9004's and they'd last 6 months or a year.  Or do I have some other voltage / current issue or something?  Please help.

Thanks,
-Dan  (Boston)
87 4kcsq 197k mi H&R, Boge, H$ Euros
Cross drilled Brembos, etc.