My TransporterHQ lights came with bulbs fitted and then some extra bulbs which were brighter so I fitted these before the lights were fitted.
Fitting cost me £60 but that was mates rates so £90 seems ok based on the fact you need to remove the front bumper to fit the new lights.
Yes TransporterHQ do have a lot of wires but I havent had any issues with them and they are brighter than the standard H4's that come as standard.
I havent had any warning lights come on and I believe you can now get a LED version of this headlight from T6 DRL Headlights Black With Philips LED 6000K Dipped Beam Bulbs but I have no idea how good these are.
THQ worked for me and fitted for free for £450. You can buy whatever bulb tickles your fancy between that and the price of Travel lites lights