1. U. S. Department of Energy, National Lighting Inventory and Energy Consumption Estimate, Vol. 1, U.S Government Printing Office, Washington, DC 2001, p. x.
2. U. S. Department of Energy, National Lighting Inventory and Energy Consumption Estimate, Vol. 1, U.S Government Printing Office, Washington, DC 2001, p. xii.
3. U. S. Department of Energy, Illuminating the Challenges: Solid State Lighting Program Planning Workshop Report, U.S Government Printing Office, Washington, D. C. 2003, p. 1.
4. High Power LEDs - Technology Status and Market Applications
5. Nearly 100% internal phosphorescence efficiency in an organic light-emitting device