BigBlock,

Are your heat considerations based on standard white LED's? If so, you're right. The number of white LED's needed to equal an HPS would generate more heat.

Were talkin red and blue LED's with state of the art technology. Read this article, its very interesting, and its from a neutral site with nothing to gain from LED sales.

http://www.space.com/businesstechnol...ng_010926.html

Let me know what ya think.

peace,

joe.