Iridium is 40x rarer than gold and total world production is only about 10 tons annually. Indium is also pretty rare, but not as rare: 1000 ton annual production. So I think if iridium is a substantial component of solid plastic lighting source then that will not be a useful technology for Average Joe Consumer. I would think you'd want ingredients common enough for million-ton production. If they can remove the need for Iridium and other rare elements, the general concept sounds excellent as a future lighting source. -- Warren D. Smith http://RangeVoting.org <-- add your endorsement (by clicking "endorse" as 1st step)