Question about the new LED street lighting

[davelew.livejournal.com]

This is a long shot, but there's enough random information on this community that I thought somebody might be able to help.

The city of Somerville is switching from old sodium vapor street lights to new, more energy efficient LED street lights. That's great and I support it, it's good for the environment and for the city's finances. The problem is with my telescope. I have a filter for my telescope that cuts out light pollution from old-style lights, by blocking light at precisely the wavelengths of the emissions spectrum of sodium atoms. Unfortunately, that filter does nothing for the new LED lights. It's nice to have a filter for urban astronomy if you're looking at anything dimmer than the moon, and I don't know what filter(s) to get.

So, here's my random question: Does anybody know the emissions spectrum of Somerville's new LED lights? Or even a single particular wavelength that they don't emit? I'd even be happy with a model number so that I could contact the manufacturer.

Comments

[dphilli1.livejournal.com]

Except for the fact that I'm actually in Medford and I've already petitioned the city to have the light removed, including neighbor's signatures

[davelew.livejournal.com]

When I was in college, we used to "shoot out" lights by shining a laser pointer at the top of the light (you had to be above the light, pointing the laser downwards), so the light's photosensor thought it was day and shut off the light. I have no idea if that still works on today's lights, but a fixed laser pointer on a tripod in an attic window running on an AC adapter to shut off a street light would be pretty cool.

[clevernonsense.livejournal.com]

At my old job, a residential neighbor used to "shoot out" the nearby flood light by...well, shooting it.