250w or 400w Please help

[Mrfish55]

The reflector definately makes a big difference, I am running 3x400w in a coralife fixture over the 300 reef and only 2x175w in lumenmax elite reflectors over the 750 fowlr and to the naked eye the 750 looks just as bright as the reef (even better spread and the 750 has a 8'x5' footprint) I have not tested par values and am sure there is a difference. If I could re do the lighting on the reef I would go 3x250w in the lumenmax elite reflectors.