Just curious: What brand/model of light has 3200 lumens? I've never heard of one that powerful.
That said, I think 3200 lumens -- or anything over 1000 lumens -- is probably overkill. My main light (Light & Motion Urban 800) has 800 lumens on high, but I almost always run it on medium, which is 350 lumens. I have no need for anything brighter. My previous handlebar light (L&M Taz 1000) had 1000 lumens high/ 500 lumens medium, and it didn't seem any brighter than the 800/350 lumen model.
I also use a helmet light (L&M Vis 360), which is only 120 lumens high, 60 low. I usually always run it on low but it seems much brighter than 60 lumens because the beam pattern is more focused than most lights.
Maybe I have better night vision than some cyclists, but I personally have found no need for a mega-lumen light system.