[Hoppy]

Are the tank dimensions in inches? If so, I don't believe you have enough LEDs to light the whole tank.

 

[skanderson]

I would avoid the cool whites or at least mix them with an equal amount of warmer light. things look very washed out to my eye with that color temp of light. the new emitter that is getting me excited is the luxeon cob. you can get an efficiency of over 100 lumens per watt and get a 5 k light with a 80 cri. the cri of the xmls is not that good. everyone has a different preference in the color temp of the light on their tank but I lean toward a lower k with a higher cri with a bit of supplemental blue and red to add some pop.

 

[skanderson]

to add to hoppys point if you dimensions are in inches that is a 220 I think. my 300 is lit by 150 watts of very efficient leds and would qualify as high light. I would aim for a max wattage of around 100 over a 220 so I could have higher light if needed and dim it down if I wanted a lower light level. that will also allow you to change the color temp if you run the reds and blues on a different string than your cool and warm whites.

 

[Renrag39]

Yes, inches. Yes, 220g.
Will check out the CoB.

OK, need to ramp it up a bit and soften the colour temp.