What other benefits are there in an LED conversion?
LEDs last far longer than existing High Pressure Sodium (HPS) streetlights. The new LED fixtures are rated to maintain at least 70% of their light output for 100,000 hours, which is about 20 years.
The LED fixtures will reduce light pollution and lower the amount of trespass light shining onto yards and into houses.
? Unlike the majority of the city’s current streetlights, the LED lights will shine almost no light above 80 degrees up from vertical and zero light above 90 degrees up from vertical.
? The new LED streetlights will produce 58% less light then the current HPS streetlights. However, they will look as bright as the old fixtures because the light they produce is more useful to the human eye.
? While current streetlights shine light in a 360 degree circle around the light, the new LED fixtures will shine light predominately up and down the street, greatly reducing the amount of light trespass into yards and windows.
Because they use less energy, LEDs also help to reduce greenhouse gas emissions. Switching to LED streetlights will reduce the city’s greenhouse gas emissions by approximately 300 metric tons of CO2 per year.
Light from the LED streetlights make colors look brighter and more “true” to natural color. Trees look green instead of brown, a blue car looks blue instead of grey. Due to this improved color rendition things appear brighter and sharper under LEDs which is why police and other safety personnel prefer LEDs.

Show All Answers

1. What is the entire scope of the conversion program?
2. How will this conversion effect the city’s energy use and budget for streetlights?
3. What other benefits are there in an LED conversion?
4. What is an LED?
5. What type of streetlights did the LED streetlights replace?
6. What does color temperature mean?
7. Hasn't the American Medical Association (AMA) raised health concerns about LED streetlights?"
8. Shouldn’t the new LED streetlights be shielded so that drivers cannot see the source of light?
9. Will new LED streetlights produce unwanted spill light?
10. How do I report an LED outage or request a house shield?
11. Does the City use LEDs for any other fixtures currently?
12. How did the City determine streetlight wattages and brightness levels?
13. Did the City consider a wireless control system that would allow dimming of the streetlights?
14. Have the LED streetlights resulted in higher levels of blue light?
15. Is there a connection between LED streetlights and circadian sleep cycles?
16. What other Massachusetts municipalities have converted streetlights to LED?