Are any large cities using LED traffic lights?

  1. Você está aqui:  
  2. Página Principal
  3. LED knowledge
  4. why are LEDs of some colors are more expensive than LEDs of other colors?
* In Idaho, the largest county has two cities who have made the switch to LED traffic lights. * In Allentown, Pennsylvania, an SEF grant is making the switch from incandescent bulbs to LED's possible. * The Boston area in Massachusetts also makes the transformation to save money and energy.