Human Night Vision Preservation

[bigcozy]

Re: Red light challenge!

What a thread!!! I had to read this one about five times to get a grip on it.

CPF has to have some of the most informed folks on the planet, well done.

 

[Kristofg]

Re: Red

Philips has one of those energy-saving lamps called a softtone in the form of a normal lamp, but with a pinkish coating which generates a kind of soft red light. I have one of these in my room and I have noticed that you can switch it on and off almost without loss of night vision, which isn't the case with the other colors. I know it uses about ten watts and that's more than enough to light the entire room for reading.

 

[B@rt]

Re: Red

Hi Kristofg,

I know the "Softtone" lamps, and to be honest, the amount of light produced by them is sufficient to kill true nightvision.. Did you ever try to go into a really dark enviromment afterwards? /ubbthreads/images/graemlins/icon3.gif
You definately loose a lot of your nightsight, due to the shear amount of light produced by the Softtones...

YMMV though...

 

[Wim Hertog]

Re: Red

The softtones let enough other wavelenghts thrue to kill your nightvision! They are not pure red...

 

[Kristofg]

Re: Red

I didn't mean to say that it does give you perfect night vision, I just wanted to say that the pink softtone lamp seems to give off much more light than the white ones do once you get used it. I found that I could see a lot more in my room with the pink ones than with the other colors available.

 

[Wim Hertog]

Re: Red

Yes, this could be normal...incandescent lights give most of their visible light energy in the red part of the spectrum. If you take, lets say, a blue color filter, the amount of light that passes the filter is much less, so this could be a logical explanation.

 

[B@rt]

Re: Red

Wim, as I understood they are not incandescent but cfl, wich means there isn't much ir radiation produced... /ubbthreads/images/graemlins/rolleyes.gif /ubbthreads/images/graemlins/icon3.gif

 

[Kristofg]

Re: Red

They are cfl, but I think the difference is simply the color of the light. Red light seems to be kinder than white light to night vision. I can't take pictures to show it (unless someone invents a camera with working eyeballs /ubbthreads/images/graemlins/smile.gif ) But then again, it might simply be that there is less light with the pink/red lamp.

 

[Saaby]

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