[mseepman]

I think what you have chosen will probably work out fine but I would probably take a look at going with the XP-G and XP-E rather than the XR-E...it's more efficient, can put out more light at the 700mA and that ensures that 3 will probably be enough. If it wasn't, you could add optics which would make it enough. Once you see how bright these are, you will be shocked.

Not sure about your power supply. I use the meanwell drivers and don't have to worry about buckpucks and DC power supply matching. Going the way you are, you will be able to dim them so that has some distinct value. The Meanwell that would enable you to dim them really needs more than 3 LED's on it.