Originally Posted by
Looigi
Pretty much, you're right. A lumen is a measure of total light output. So given one light with 400 lumens and two lights with 200, the the two will product the same total light output as the one. If all three have the same light distribution pattern, the two will work like the one...except that with two you can aim each differently if desired. And you have redundancy. If you think that's worth having the added complexity and dealing with two light setups, go for it.
I agree with what's mention. I would like to emphasized in the distribution pattern as Looigi pointed out. Depending on the reflector design and type of LED, the higher lumen led can be design such that the reflector can achieve a farther throw with less spill. You can have 2 x 250 lumen side by side and not get as good of a throw as compare to a 1 x 500 lumen with a reflector design for throw.
All this will depend on what you are looking for. Before deciding, I would look at the beam pattern of the Mitycross and compare that with the two other lights to see if the beamshot is satisfactory to your need beside just the total lumen of the lights.