So for a light bar ~20" long, would you rather have 12ea 10w led's for a total of 120watts or 2 rows of 3 watt led's totaling 120watts? (Both Cree led's) I realize there are plenty of other things can influence the outcome but I was wondering on face value.

I was wondering if the larger more powerful LEDs have any advantage.

 

If you have more info it would be helpful. What brand lights are you looking at? What type of Cree LED are they using? How many Lumens per Watt are they getting. There are a lot of variables to consider before making a decision. Just because both use 120 watts, doesn't mean one isn't using that power way more efficiently.

If both are using Cree LED's, the lower wattage one is the XP-G LED, and the higher wattage one is the XML - 2. Both are good LED's, but the XML-2 is significantly better.

Be careful with claims of Cree LED's as well. A lot of Chinese companies are claiming they have Cree, when they don't.