That picture shows saturation of the detector in the areas where the headlights are, so is not accurate regarding relative brightness. It DOES clearly demonstrate that road position of a bicycle has NOTHING to do with it also. That bike's headlight is easily equal in visibility as each of the car headlights in that pic. The car headlights are just larger diameter, and their relative positions on the front of the car makes the car more noticeable. Put two 6"diameter lights seperated by a couple of feet on your bike and you'll look just like a car, regardless of being three feet farther to the right in the lane.

LED bike headlights can certainly be too bright, if used in a belligerant, selfish and inconsiderate "retinal burning" way.