Standard bulbs are 55w with high beam 60w with the mod done and both running at the same time 2 X 55w is more than double twin 35w HIDs. I've never known or heard of issues with modded standard bulb setup not running and they draw 55w each plus high beam 60w all can be running at idle. Quality ballast doesn't draw 35w and a lot less while they're running, hence they spark up, drop back and get brighter after a few seconds. Mine and the 30 odd I fitted, have had no problems whatsoever running this way, running both or when lighting up the H4.
If yours had the issues as you state they were either wrongly wired, poor quality units or there was something wrong with your battery/charging system. In my experience issues with HID are on start up or at the point where the draw drops not while they're running ie idling in traffic.
Lighting issues at idle are mainly charging system related, oh and the battery isn't pulling anything like 12 amps, certainly not if it's in good condition.
If yours had the issues as you state they were either wrongly wired, poor quality units or there was something wrong with your battery/charging system. In my experience issues with HID are on start up or at the point where the draw drops not while they're running ie idling in traffic.
Lighting issues at idle are mainly charging system related, oh and the battery isn't pulling anything like 12 amps, certainly not if it's in good condition.
Later