Xm-l Whites are where its at...100lm a watt, 1000lm one chip up to 10w each.
http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXML.pdf
Cool White, Neutral, and Warm White, + 630 Cree, and 660 Osram or Luxeon Rebel, Best performance by far...