Lights inside U-boat... - Page 2

Wim Libaers · 05-25-06, 03:53 PM

Quote:

Originally Posted by werauchimmer

I obviously canÂ´t speak for WW2 sub crews, but the modern day german infantry uses blue instead of red. Preserves the night vision as well as red does and canÂ´t be seen as far. Something about the ambient light having blueish components, i think. (I had to learn that, but, well, i forgot the exact reason.)

Actually the standard issue flashlight has four colour filters: Red, yellow and blue, so you can use it for colour coded signalling.

Four colour filters? What's the fourth one?

And yes, blue light doesn't attract the attention as much, is a bit harder to focus on, and has more propagation loss due to scattering in the atmosphere.
http://hyperphysics.phy-astr.gsu.edu...n/rodcone.html

TLAM Strike · 05-25-06, 04:02 PM

Quote:

Originally Posted by Wim Libaers

Quote:

Originally Posted by werauchimmer

I obviously canÂ´t speak for WW2 sub crews, but the modern day german infantry uses blue instead of red. Preserves the night vision as well as red does and canÂ´t be seen as far. Something about the ambient light having blueish components, i think. (I had to learn that, but, well, i forgot the exact reason.)

Actually the standard issue flashlight has four colour filters: Red, yellow and blue, so you can use it for colour coded signalling.

Four colour filters? What's the fourth one?

I seem to remember having one with a translucent and transparent white filters. But I got it second hand.

(Flashlight broken for many years now.

)

werauchimmer · 05-26-06, 02:52 AM

Quote:

Originally Posted by TLAM Strike

Quote:

Originally Posted by Wim Libaers

Quote:

Originally Posted by werauchimmer

I obviously canÂ´t speak for WW2 sub crews, but the modern day german infantry uses blue instead of red. Preserves the night vision as well as red does and canÂ´t be seen as far. Something about the ambient light having blueish components, i think. (I had to learn that, but, well, i forgot the exact reason.)

Actually the standard issue flashlight has four colour filters: Red, yellow and blue, so you can use it for colour coded signalling.

Four colour filters? What's the fourth one?

I seem to remember having one with a translucent and transparent white filters. But I got it second hand.

(Flashlight broken for many years now.

)

On the older flashlights its not so much a colour than geometry: A dark filter with a small slit, so you can restrict the brightness. On some of the newer ones and/or some of the US models I saw with US troops it was a whitish, milky looking filter, serving much the same purpose I figure.

05-26-06, 11:58 AM

On our ship we always "Rigged for red" at night. I'm pretty sure everybody does that.

Quote:

Originally Posted by CCIP

The blue lights in Das Boot indicated "silent running".

Can't speak to the realism of it, but it at least seems like a plausible idea.

That's the best explanation I've heard yet: it would be a constant visual reminder to stay quiet.

VipertheSniper · 05-26-06, 12:31 PM

I've seen the movie 3 or 4 times, and I seem to recall that they say they're the emergency lights... which doesn't make much sense I think. Pretty sure it was all lights out, and then the 1WO says "Notbeleuchtung an"

Silent running is a good call tho.

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05-26-06, 12:31 PM	#20
VipertheSniper Ace of the Deep Join Date: Sep 2002 Location: Austria Posts: 1,074 Downloads: 0 Uploads: 0	I've seen the movie 3 or 4 times, and I seem to recall that they say they're the emergency lights... which doesn't make much sense I think. Pretty sure it was all lights out, and then the 1WO says "Notbeleuchtung an" Silent running is a good call tho.