some one must be modding the bulbs to fit h4
I do not think phillips or Sylvania
makes a hid bulb to fit h4 etc.
hid bulbs made in china or taiwan maybe.
as the color temp goes up the lumen output of the hid bulb goes down.(need to quit soldering and typing at the same time)
around 5200 - 5800 k you get about 2400 = 2500 lumens vs 3200 lumens at around 4300k.
I think phillips makes the best 35/50 watt d1s - d2s bulbs.
the phillips mpxl dl35 and the mpxl dl50 are pretty exspensive.
390.00 for 1 bulb - the 50 watt is the same price as the 35 watt.
http://atlantalightbulbs.com/ecart/nw012104/MPXLDL50.htm
I will try to find the link I have to get them at a reasonable price.
the phillips d2s 85122's are around 40 bucks or so on ebay.
phillips d2s 85122 - 4300k 3200 lumens.
I think phillips developed the d1s/d2s 35 watt micropower hid light.
I bought two phillips 35 watt ballasts from ebay.
they came with 2 new in the box phillips mpxl dl35 bulbs.
I paid 220.00 shipped from ebay.
the ballasts are very nice they draw 39 watts after they warm up.
there was a spec sheet that listed the dl35 and the dl50 spec's
so I looked for a dl50 and got lucky.