led's

It's time I got some LED's for my 2 rooms, both are 1200w x 2300l x 2400h.Am currently running 600 and 400watts HPS, in each. I want to use the 400w's in the winter (for the warmth )with an LED each end, so would need 3 for each room . But for me it all gets just so confusing with footprints...