this has been covered in hid planet, some of these aftermarket bulbs (even some quality bulbs)are having issues with the newest oem ballasts. Can't recall whether it's denso or matsushita ballasts but the best cure is buying Phillips osman oem bulbs which have no issues. Best bulb on the market for color and lumens is CBI bulbs. Although the I spent $200 for a pair of those bulbs.
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