heres the thing, yes the bulbs will all be the same brightness, but they will put out totally different brightnesses. The output is changed by the configuration of the lamp itself, look at your low beam lamp, it has that cap on it and the sides come out a bit further. the high beams dont have either of that, making the output much brighter.
I have 6K in my lows and 8K in my highs, i got both kits from ddmtuning.com and they work great. Most people on this site would recommend ddm as they are much cheaper and work great. as far as the bulb type, its h11 for lows, h9 for highs, and 9040 for the fogs.
Hope that helps and if i confused you let me know and ill try to explain it better.
Visual Mods: Back half 5% tint, Front half 15% tint, 5% Eyebrow tint, Rain guards, Debadged, Arrowhead overlays, Interior LEDs, Painted engine covers, Tinted tails, 6K Low Beam HID, 8K High Beam HID, Painted Grilles, Painted Door Trim
Performance Mods: CRAB intake, 18" Toyo Extensa x 4, Racingline STB, Racingline Grounding Kit
Audio Mods: Head Unit: Pioneer AVH-P5100DVD, Front Speakers: Memphis 6 1/4, Rear Speakers: Memphis 6 x 9, Subwoofers: Kenwood KFC-W3012 12" x 2, Amp: Kenwood KAC-8105D 500W