Somehow we all survived with mercury vapour long before you ever had your high pressure sodium lights, and people didn't have issues generating melatonin back then.
I've been in lectures from doctors that have looked into this, and it appears as though this is one of those things that the media grabs onto, but there's really nothing to be concerned with.
I don't know what lights were specified for Calgary, but my guess is they are either 4100K or 5000K. We started at 5000K and then decreased the temperature in future bids because the 5000K was seen to be a little too institutional. Apparently that's a bad thing for streetlights?? The higher the temperature the greater the efficacy of the bulb, but there are other points to take into consideration, as well.
Regarding the lack of uniformity in your new lighting system, that probably has more to do with design than with the LED themselves. You can choose different light patterns and different wattages to achieve similar uniformity as the older lights. Chances are the wattages selected might be too low if they aren't getting the spread necessary.
|