DIY LED Lighting Fixture

Hi,

I am planning for a 3' L x 2' W x 1.5' H high lighted planted tank. Would 12 numbers of XP-G series (XPGWHT-L1-0000-00H51) in a row would be sufficient for my tank. The LED angle for this series is 125 Deg. So thinking only a row would be sufficient enough to light-up my tank. Moreover the height of the tank is only 18 inch.

Suggestions please.
 
Looking very good Keno! I really like what you have done, your tank looks really pretty good. You have done a great job, I have seen some projects where many people are building their own LED lighting systems and I am very interested in this technology. I wanted to get a LED fixture but the cost seems to be somewhat really high. Could you suggest me some best led fixture available at low cost?
 
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