http://dkc1.digikey.com/us/en/mkt/TechZ ... _magazines
See "Lighting Solutions Magazine - November 12, 2010"
Then see article on page 22 about Thermal Performance including thermal Via's. The article is titled "optimizing PCB Thermal Performance for Cree XLamp LEDs"
The short hand version is that a typical 1.6mm (.0625in) thick PCB's thermal resistance is around 30C/W and can be boosted to 12C/W (250% better) by adding SnAgCu filled .6mm vias.
PCB Thermal Performance
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