Overall, the LED development trend showed significant efficiency improvements and cost reductions year over year.
The development of LED technology has caused their efficiency and light output to rise exponentially, with a doubling occurring about every 36 months since the 1960s
The current rate of cost decline in LED lighting systems is about 25 percent a year since 2005
Recent industry road mapping indicates prices for warm white LED packages have declined by half, from approximately $36 to $18 per thousand lumens (kilolumens, or klm) from 2009 to 2010. Prices are expected to decline significantly, to approximately $2/klm by 2015.