Have the LED streetlights resulted in higher levels of blue light?
Possibly, but minimally at the most. It is more likely that the new LED lights have reduced the amount of blue light produced by the City’s streetlights. This is because, while the light from 3000K LED lamps contains a higher percentage of blue light than found in the light from HPS lamps, the LED fixtures will produce far less light (58% less light) than the HPS fixtures. Remember, the light from LED lamps is far more useful to the human eye, so less light is needed to provide visual clarity and the city is reducing perceived light levels in several parts of the city. The City calculates that the new lights are producing somewhere between 24% less blue light up to 6% more blue light than the lamps they replaced.

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?