| |
[index]
[month]
[prev]
[next]
[thead-prev]
[thread-next]
Subject: [M]: Re: A Night Vision Question
From: Mike Dodd
Reply To: mapug@shore.net
Date: Sun Aug 12 03:18:02 2001
|
While you're here, how about checking out the
Astronomy Book
List ? |
>I want to know if putting red cellophane or something like it over a white
>light source like a light bulb really helps retain ones night vision or
>does the actual wavelength have to be in the red to start with( i.e., a
>purer red)?
Red is red. ;^)
"White" light contains all the colors in the spectrum, so if you put a red
filter over a white source, only the red light comes through. Naturally,
the more narrowband the red filter, the "purer" the red light will be.
The Navy has been using red glass over white lamps for decades.
Mike
------
Mike Dodd - Montpelier, VA
Modeling Virginian Railway, 1954
http://virginian.mdodd.com
View index by [date] [author] [subject]
Previous message: [M]: A Night Vision Question, Brady Blozvich
Next message: Re: [M]: (m) 2 ?'s, PC
Next message in thread: Re: [M]: Re: A Night Vision Question, R. A. Greiner
Previous message in thread: [M]: A Night Vision Question, Brady Blozvich
|
|