I don't know how to estimate how much more light, but- distance is increased immensely, daylight equivalent as opposed to the dull yellow standard lights produce.
I'd say way better than the high wattage simulated HID bulbs and they use next to no power!
Seriously next to no power.
With the high wattage bulbs I could see the charging needle drop a little, but with the HID Conversion no movement at all.
Trust me I was a little leery about spending the $700 to have them installed, but after one night I was completely satisfied.
On a drive from NY to Vermont in some intense snow they were the only reason I could see the road.
I pity the poor fools who were driving with factory lights on that night.