Preferred Light Pollution Filter

Started 1 week ago | Questions thread
mermaidkiller Contributing Member • Posts: 895
Re: Preferred Light Pollution Filter

acktown wrote:

If the lights are LED then the light pollution filters are useless as they are full spectrum. If the lights are Sodium/Mercury vapour (orange) then pretty much any reputable filter company making night sky filters will do.

Depends on what filter. Broadband LP filters, such as the Astronomik CLS indeed don't help much, but more narrow banded filters such as UHC-E do work. The light output of LEDs around 500nm (OIII and Hbeta) is considerably lower, particularly when 3000K LEDs are used, which are becoming more common. And Halpha is barely emitted by LEDs.

Output curve of a 5000K (harsh white) LED, the yellow one is sunlight.

But they are easier to post process because it is more or less gray, instead of the ugly orange red of sodium light.

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