Timeline for During night flying, which color lens for a flashlight is most beneficial?
Current License: CC BY-SA 3.0
16 events
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| Apr 13, 2017 at 12:48 | history | edited | CommunityBot |
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| Dec 16, 2014 at 18:38 | comment | added | Keegan | Sorry. My bad. I don't know why I was so confused. You are all right. | |
| Dec 16, 2014 at 11:45 | history | rollback | Federico |
Rollback to Revision 3
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| Dec 16, 2014 at 10:06 | review | Suggested edits | |||
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| Dec 16, 2014 at 9:56 | comment | added | J... | @SpongeBob Your edit is wrong. "Above 650nm" is both the correct phrasing and the logical unit (nm) to use. "Above" means higher, longer, or greater -> in the direction of infrared if we are talking about wavelength. By changing the unit to frequency, "above" now still means higher, but this instead means faster -> in the direction of shorter wavelength or towards blue and UV. Also, as a scientist and engineer who has worked with optics and visible light for many years, never have I seen anyone use THz as a working unit. Frequency is popular in some EM ranges, but not this one. | |
| Dec 16, 2014 at 8:41 | comment | added | user | @SpongeBob If you believe that your edit is accurate, you really should make it on the original answer as well. Right now the quote disagrees with the original. Personally I find your edit confusing; "above X frequency" is equal to "shorter than Y wavelength" where for appropriate units Y=c/X, and as you reduce the wavelength of visible light, you go from red (at the long wavelength end of the spectrum) to blue and ultimately violet (at the short wavelength end). So saying "above 461 THz" is very different from saying "above 650 nm". Light is also commonly discussed in terms of wavelength. | |
| Dec 15, 2014 at 18:22 | comment | added | Keegan | Oh. My bad. I just assumed you meant above 650nm wavelength... since that's what the answer says. But you really meant above the frequency of light with a wavelength of 650nm. Basically visible light between IR and 650nm is best for preserving night vision. I edited the answer to show frequency instead of wavelength so it's not as confusing. | |
| Dec 15, 2014 at 18:21 | history | edited | Keegan | CC BY-SA 3.0 |
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| Dec 15, 2014 at 17:55 | comment | added | Gabe | @SpongeBob: Higher frequencies are shorter wavelengths, so 595nm is a higher frequency than 630nm. The important thing to note is that activating rods (about 600nm and shorter) causes the rhodopsin in your eyes to bleach (which means you lose your night vision). Since the cones do not help you see detail, they are not useful for things like reading instruments or maps. So you want to minimize your rod exposure while maximizing your cone exposure. Your eye has more red cones than any other color, so using red light makes the most sense. | |
| Dec 15, 2014 at 17:30 | comment | added | voretaq7 | Note that you'll probably need a plain white flashlight anyway -- as abelenky points out red is a lousy light for color discrimination (charts and gauges should be illuminated with a light that lets you see colors). Red/White LED flashlights are easy to find (I personally like bicycle headlamps for this purpose since you can usually dim the white light). | |
| Dec 15, 2014 at 17:00 | comment | added | Keegan | Thanks! I guess I'll keep it below 650. Cree has a few colored LED options - their Amber-595nm, Red/Orange-620nm and the Red-630. Does this mean using the Amber will preserve night vision better than the others? | |
| Dec 15, 2014 at 16:40 | vote | accept | Keegan | ||
| S Dec 15, 2014 at 16:09 | history | suggested | user | CC BY-SA 3.0 |
Incorporate from linked question
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| Dec 15, 2014 at 15:51 | review | Suggested edits | |||
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| Dec 15, 2014 at 14:17 | history | edited | Farhan | CC BY-SA 3.0 |
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| Dec 15, 2014 at 8:41 | history | answered | Amazon Dies In Darkness | CC BY-SA 3.0 |