Improvements In LED CREE Emitters
As an example of constant improvement in LED technology, this video of CREE Inc's latest emitter technology as proposed for street lamps and other applications, is instructive. Regularly they release the next step with often 50-100% improvement in light output for the same energy in. Also this particular unit can operate at much high temperatures.
This glimpse reveals how CREE's units are vitally important for the future of energy efficient lighting that benefits us all.