LED lighting is clearly a path forward. The challenge, as with all "promising but currently too expensive" new clean energy technologies is how to get from here (low volume, high costs) to there (high volume, low costs). The bulk of cost reductions typically come from economies of scale, which moves industries down the learning curve. So what brings us the larger volumes? Is it more government subsidies for research? Is it regulations or rebates that drive market demand? In a recent Technology Review article (LEDs Are Getting Ready for the Spotlight), Josie Garthwaite describes another option, which follows on my earlier post about finding new problems for old solutions.