6.2 Is there any other reason not to switch to LEDs?.6.1 Are there any problems with not melting snow?.5.2 How much pollution is prevented switching an average intersection to LEDs?.5.1 If the street lights are running on coal-fired electricity - how much carbon dioxide emissions are prevented by switching to LEDs?.4.11 How much money does it cost to make the switch (labor + materials)?.4.10 What is the payback time and return on investment for red hand LEDs?.4.9 What is the payback time and return on investment for white man LEDs?.4.8 How much money is saved over the lifetime for switching out a walk/do not walk sign with an LED?.4.7 What is the payback time and return on investment green LEDs?.4.6 How much money is saved over the lifetime for switching out a green light with an LED?.4.5 What is the payback time and return on investment for yellow LEDs?.4.4 How much money is saved over the lifetime for switching out a yellow light with an LED?.4.3 What is the payback time and return on investment for red LEDs?.4.2 How much money is saved over the lifetime for switching out a red light with an LED?.4.1 What are the major variables in determining savings?.3.4 Are any large cities using LED traffic lights?.3.3 Who manufacturers LEDs for use in traffic lights?.3.2 What colors are LEDs available in commercially?.3.1 How do you replace a normal incandescent street light with LEDs?.2.5 How many incandescent bulbs (and light bulb changes) do you need to last as long as a single LED?.
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