Draws the 12v current and than via the ballasts increases to higher power needed for the hid.
No pressure on the car system.
My kit for the merc (I have used on few cars) is just a regular of flea market kit. Chinese version, no burnouts all I have installed so far work fine
It shouldn't cost more than 100 bucks for all the parts
Make sure to get the smaller ballasts (like the ones pictured)
For little more money you can get a kit that has highs and lows in one bulb
Only thing you have to decide is what temperature color you want
I got the 6500k which is really white
Above those numbers you are going blue/purple color
It is the best upgrade I have done
While you are at the topic of the lights upgrade the turn signals and rear lights with high end led bulbs
Check my posting how I did with mine
People can see me now well and I love the clear clean crisp light they generate.
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