Maybe you were just unlucky enough to get bad bulbs both times. Are you making sure you don't touch the glass? You should clean them with alcohol to rid the glass of any oils or dirt that could cause them to burn out. You might consider an upgrade wiring harness too. You can get one here.
Suvlights.com
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Stillen kit & grill, Stillen Type II spoiler, KYB AGX/Progress, 19x8.5 ADRs w/Toyo Proxes FZ4s, ...........