Streetlight LED Conversion

[BuildingScout]

I actually researched this a while back. Light pollution goes down substantially with LED lighting. There are two reasons: (1) LED light is more focused and (2) the lamps can be placed lower down, this leads to higher level of lights at ground level with reduced leak upwards.

This can be true, if you do it right. The opposite has been seen in some places.  The experience of the residents of Davis California should factor into what is implemented elsewhere.   To #2, surely they won't be replacing all the lamp posts in the city with lower ones.  There is a lot of information out there (including a statement from the AMA which I presume to be some kind of expert on medical issues, more so than me), and studies that have looked into glare and other consequences of poor installation. All I'm saying is I hope they are doing appropriate research to implement it correctly.  I don't think that's an unreasonable ask for something that will impact almost every outdoor space in the Region.

Not sure where you are going with this. The opposite has not been seen in some places. The Davis Caifornia case was simply placing LED lamps that were too bright which are to be replaced with less bright LED lamps. This mistake could equally have happened with sodium lights, if you place ones that are too bright. I also don't understand why you think the lamp post needs to be replaced to bring the light down.

By the way, the reason I looked into this was because the sodium lamp industry tried to start an astroturf campaign in NY/NJ back when they were in the process of approving the switch to LED. At the time I had no opinion on which option was better, so I went and looked it up. Turns out LED lamps are far superior and the campaign was all falsehoods and fear-mongering.

p.s. in the end Davis was a success story because they replaced the led lights with even lower wattage thus increasing the expected  savings and further reducing light pollution.