What does color temperature mean?
Color temperature of lighting is measured in Kelvin (K) units. Lower temperatures are warmer and yellower; higher temperatures are cooler and bluer. Our existing high pressure sodium (HPS) streetlights have a color temperature of 2200K. LED streetlights have color temperatures ranging from 3000K or lower (warm white) to 6000K (day white). The LED streetlights that are being installed have a color temperature of 3000K, which is the warmest color LED lamp that the city can install and still receive a rebate from the electric utility.

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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?