LED Stoplights

Raleigh NC is shifting their public lighting to LED's.

This may be somewhat efficient, as LEDs have a lumens per energy ratio of about 35. Incandescents have about 30. However, special bulbs have up to 85. There are probably more efficient light sources than LED's.

However, unidirectional light requirements, such as stoplights, do not require field light sources, so LEDs are probably among the more efficient systems for those applications, except for the electronically controlled light with a mirror system.