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Thread: Green Vs Red light for NV

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    Default Green Vs Red light for NV



    I had a bag stolen while I was recently on vacation. It contained random stuff which included my night sky Binos, and my redlight headamp. I replaced the headlamp with an Amazon purchase below:
    Epic 3V Headlamp

    I like the features size and weight but I haven't seen anyone use green for preserved night vision. Is there any reason? One fleeting thought I had when I made the purchase is that it will make me and my son easier to identify. We are roughly the same size and build. Now He will have Red and I will have green. We will also look festive at Christmas. LOL
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    Default Re: Green Vs Red light for NV

    Green, though better than white is really not good for your night vision. Red is really the color you should go for as the eye's night vision is really not affected by it. I would *highly* recommend getting red - despite the Christmas effect. While in the US Navy there was an experiment in using low level blue, and I can tell you I was completely blind when I had to go to the bridge at night which was lit with red. With red lights it was easy to pop in and out of the bridge and be instantly adapted to night darkness in the middle of god-knows-where-Pacific Ocean (or other ocean). Green is far worse than blue.
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    Default Re: Green Vs Red light for NV

    Now the argument is red vs amber The debate never seems to end.

    Here is a review of a red headlight I did sometime ago. I still use this headset to this day

    Best red headlight so far.. brief review...

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    Default Re: Green Vs Red light for NV

    The reason red is used for night vision is that red is the colour that scotopic (monochrome, rod cell) vision is least sensitive to. Since it is the rods that allow us to see dim objects, light that does not dazzle the rods allows us to see at night without impacting our night vision.

    Green and blue do dazzle the rods, thus impairing night vision for 20 minutes or so.

    There is much debate over the superiority of amber over red. Amber is sufficiently long-wavelength that the effect is similar to red, provided that the intensity is kept low enough. Let the amber light get too bright and the rods will start to lose their effectiveness. The advantage of amber is that the cone cells are more sensitive to it than to red, allowing it to be useful at lower light levels.

    The key to using amber light (red light too, of course) is to keep it dim. There is no way that you can have green or blue bright enough to see anything by without ruining your night vision.
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    Default Re: Green Vs Red light for NV

    Here's a test I completed with all wavelengths 2 years ago:

    Red vs Amber Tesiting Results

    I swapped most of my led lights to Yellow/Orange @ 590nm.
    If I'm observing with other astronomers, I still use my red light so not to start a argument.
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