Assumptions (Score 2, Interesting)

The assumption that increasing the efficiency of light sources will decreae energy use for lighting is nothing more than that -- an assumption not based on any actual evidence. There is some evidence that increasing energy efficiency actually increases energy use because energy becomes a cheaper input.

See:

http://www.energytribune.com/articles.cfm/5176/Energy-Conservation-and-Future-Energy-Demand

and...

http://en.wikipedia.org/wiki/Jevons_paradox