Is having 2 medium intensity lights similar enough to having a really bright single beam? For example, two 250 lumen lights comparing to one 400-500 lumen light. I ask this question because of the cost of lights such as the Cygolite Miticross 400. It's $250 but for $120/250lumen light I can get a "combined" 500 lumens for $240. Or am I just being ignorant? I also think having 2 lights is better because one can be run at the full 250 lumens to see while the 2nd can be run at the normal lower setting as a "see me" light, thus ensuring you'll rarely, if ever, deplete both batteries on the same ride at the same time.