LED Streetlights cause more damage to wildlife and environment than HPS

Doesn't matter what technology produces the light- you could get LEDs that produced only 590nm output like an LPS lamp and gain both the touted benefits of low power consumption and better wildlife compatibility.

 

Light Pollution...now that's funny.

 

every solution has its own problems. less bad is always the goal

 

Yes, light pollution effects on the natural world were known before LED became the norm. Seems what would be good for animals may not be good for plants by @Rmay635703 second link. Though a narrow wavelength band red LED might be the solution.

"One roadway luminaire manufacturer has recently taken this approach with a new product line that was reportedly designed to comply with the International Dark Sky Association’s Fixture Seal of Approval program requirements for a maximum CCT of 3000 K. While the approach works (with a measured CCT of 3145 K), the massive spike in red light peaking at 625 nm (Figure 8) would seem to be a botanist’s nightmare spectrum.

Surprisingly, the situation may not be as bad as it appears. First, there is relatively little far-red radiation being emitted. Second, the 625 nm peak occurs where the phytochrome Pr absorptance spectrum is only 50% of maximum. This results in a calculated phytochrome action value (relative to the HPS reference lamp) of 0.9 - half that of the 3000 K LED."

That particular product also has white LEDs, so still an issue for animals though. It does show that LED can be the solution. The paper also mentions others.

 

I was stumped on just the second acronym, so anyway:

LED : Light Emitting Diode
HPS: High Pressure Sodium