Originally Posted by
surgeonstone
I ride rolling flat roads that are very straight and country quiet. 5-10 cars in an hour riding is busy. Sometimes go 2 hours and pass or am passed by only 3 cars. Very dark farmland, no street lights.
Given that, my guess is that the 400 would be plenty. Even the 200 might work if you are young with good eyes
Personally I think that riders need more light in more crowded areas with street lights and cars. Thee streetlights and cars tend to wash out the bike lights.