OK, what are we talking about when we say spreading out the light? Are you saying 2x 50w is better than 1x 100w? Depends. You've got 100 watts illuminating one spot on your plant. That spot is getting good light, and other spots are getting marginal light. Now you divide that 100 watts into 2, and put one 50 watter on each side of the plant. Now 2 spots are getting half the light that one spot was getting. Which way will make the plant yield more? I'm betting same same. Kinda like topping makes more bud sites, but they are smaller so the end result is the same.

I could be wrong. It happened once before.