It is a hi/lo system with one bulb. And there is absolutely no lag between the hi and lo beam. Haven't had it on road yet, still waiting for my fuel strainer so i'll see how it looks on road, but in garage it's damn bright. I'll leave it on, i figured there was a reason for it. HOw are you guys getting a 2 bulb system in these headlamps?
Of course there is no lag. You only have one bulb.
The lag I am referring to is in a 2 HID bulb setup, the lag being the time it takes the high beam bulb to warm up.
I made my own 2 bulb system. I trimmed away the mounting base from the two bulbs, made my own mounting base to match the H4 configuration and then put the 2 bulbs into the new base. I run a relay so the low stays on even when the high is on, so that while the high bulb warms up, I am not sitting there in the dark. My high is 70w instead of the normal 35w, so combined with the low, I have a mini sun guiding my way.
Before I see a dozen questions on it - no, the heat from 2 bulbs has never been an issue.
Ryan says he found someone that makes a 2 HID bulb system, but I have not yet seen it.