The cheapest route is to use blueish tint H8 bulbs (still halogen), but IMHO, well it cheap solution so don;t expect much as far as light-output. It also more blueish tint instead of white. you can buy $15 for the pair.
I have the ole H8 20W LED bulb and H8 DTEC 64W. I like DTEC cause I don't need to change the color, white is what I want with max light output.
Not sure if the latest DTEC will make E71 X6 (w/o LED headlamp option) any brighter, the optic is the limiting factor not the LED bulbs. By optic I mean the circular plastic rings that make up the angel eyes.
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