New to LED. Need quick opinion. Advanced LED's Diamond Series

My wife bought me three of these for my birthday (I posted in another thread, but figured I'd try again). I have the 350s not the 150s. I wanted to do a lot more research but I've been talking about LEDs for a while so she just ordered me three of these. Thoughts on these lights? You think they will adequately cover a 10 x 20 room (with approx 10 plants in it), or should I return them.:?:

http://www.advancedledlights.com/3w-led-grow-lights/new-diamond-series-xml-10w-cree-xml/
 
10 x 20 is a bit large for 3 of the 350s. If you don't move them with a light mover they should cover 4 x 12 nicely. A light mover helps a lot. I use one because I can keep the light within a few inches of the canopy getting the most light penetration while avoiding the photonic bleaching that high intensity leds can cause.
 
The website lists core coverage as 4x4, so if you have 3 than you would cover the 4x12 as MM stated. They are pretty solid lamps, but you'll only be covering about half the room.
 
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