I bought a Sylvania SilverStar H4 bulb, and it is 100% better than the original ones. The color temp is 4000K, the ones you mentioned, the PIAA Star White come in 3800k and 4000k (plus). Mine was 19.99 at the local auto store. PIAA also has the H4 SUPER PLASMA GT-X, that are 3800K low, and 5000K high beam.
PIAA
A true HID requires a ballast and igniter for the high voltage light, so you would need a conversion.
The H4 is the same as one of the other Auto bulbs, I compared them, just that the H4 is approved for motorcycle use. I then later saw a package with the same auto bulb that was marked both 9003/H4, but I am pretty sure you can use just a 9003 if the H4 is not available. The wattages are identical, so do not know why the H4 just says for MC, and 9003 for auto. The 9003 has both the H/L beam, three prong setup.
The bulbs that are the same are: H4 / 9003 / HB2 @ 12V, 60/55W.
You can get them in much higher wattage, as high as 130/90W, but you risk too much heat, which can easily melt your front lens, as they are not glass anymore.
Here is the HID conversion:
From 109 to 179.00, for two bulbs and ballasts, so you can go halfers with someone to convert, but will it all fit, the electronics of it.
Here is a HID lamp that may attach to a light bar:
PIAA 610
Main page:
PIAA Hid Lamps
Probably more information than you needed, but it's all there.