Originally Posted by
rekmeyata
This has to do with the fact that a true 1500 lumen light will create a bright white road with lots of light bouncing back into your eyes off the pavement closing the pupal of your eyes to a small pin hole, this means that if you were to look to your left or right all you'll see is black and very little if any detail on a country road. I don't about you, but I prefer to have my night vision acuity because I don't ride or drive with my eyes glued to one spot on the road.
What you're describing has more to do with lens / reflector design than lumen output. I've previously posted a number of photos and comments about this in other threads. The 3,600 lumen array used in the attached photo incorporates projector lenses and Fresnel lenses to produce a wide even beam and shows none of the symptoms you've described.
