Thanks bro. I did swap and confirmed it's the passenger ballast. But for some reason it's working again. I'm at the 100 mark.

 

Mine was in the summer. The hotter it was outside, the shorter the duration the bulb stayed lit. At 100°F outside and add some engine heat and it failed in 5 min. First it would flicker, dim to an orange hue, then turn off and hum.

I did the Morimoto XB 6000k for $60 a pair and its been a year, color and output are still good. They are just white. Nothing crazy.




I bought new ballasts and bulbs. Burned in the ballasts for 24hrs to confirm they are worthy of bumper removal but never installed them. New Yoda/Denso parts.
Mind you I bought the car from dealership with bum lighting, fought them a bit and they paid for all new hardware and some labor but I was not going to let that crew pull the 350 apart.

FWIW my Mazda 6 the D2S bulbs ran ten years. The D4S being mercury free do not seem to last as long.