LED Light Bulbs

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California, Canada and now Europe are passing laws to prohibit the sale of energy wasting incandescent light bulbs by as early as 2012. The new LED lightbulbs which are just starting to appear typically have lives of 600,000 hours and use much less energy than the the incandescents. It is estimated that lighting accounts for up to 20% of the electrical energy used in the US. It is hoped that by legistlating this technology it will speed it's adoption. Does anyone know what companies hold patents on this technology and stands to benefit the most from it. I would like to invest if their stock is not already through the roof.