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Old 17-12-2008, 11:54   #1
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"Nightvision" clock needed

I would like to install a 12V DC digital clock with red LED digits in the saloon / chart area. I cannot find a supplier for such a clock, does anyone have a lead or source?
Thanks from sunny and windy Cape Town
Roger
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Old 17-12-2008, 12:16   #2
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Maybe page 78 of this pdf?

http://www.hyway.com.au/catalogue/ge...ccessories.pdf

Not sure if it glows red versus green though. I did a quick google search on "12v clock led".
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Old 17-12-2008, 14:16   #3
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Maybe page 78 of this pdf?

http://www.hyway.com.au/catalogue/ge...ccessories.pdf

Not sure if it glows red versus green though. I did a quick google search on "12v clock led".
Hi bene505,
Yes that would do fine. Have emailed them to see which colour the digits are dispayed in. Will post the answer and thanks for the link.
Roger
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Old 18-12-2008, 01:09   #4
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Hi bene505,
Yes that would do fine. Have emailed them to see which colour the digits are dispayed in. Will post the answer and thanks for the link.
Roger
Received an reply: These clocks are manufactured by VDO and no longer available in Australia.

I think I have found what I#m looking for at Index of /digital_clocks

Roger
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Old 18-12-2008, 01:46   #5
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Did I just read somewhere that Blue is a better colour to keep your night vision?
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Old 18-12-2008, 04:55   #6
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LED displays consume more power than LCD.
To preserve night vision the most important thing is to have a very dim display and dim it as you dark adapt. I think red is still better, but go for something with a very adjustable brightness. I find the glow from an analog watch is the best way to tell time and preserve night vision while sailing.
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Old 18-12-2008, 05:48   #7
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An interesting opinion ...

Night Vision - The Red Myth

... For those just looking for an executive answer as to what supplemental lighting should be used to reduced the recovery time back to night vision (dark adapted or scotopic) here it is: a fully dimmable white light! This of course is a very incomplete answer but so are the answers red or blue-green and you should know why.
Lets start with red, specifically what I will call the red light myth ...

Goto: Night Vision - The Red Myth
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Old 18-12-2008, 06:44   #8
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Gord, thanks for the link. Based upon my reading of the article, it seems that the best colour for chart lights would be 'blue-green', or cyan - the author clearly states that it is to be preferred for 'fastest dark adaptation recovery'. Yes, dim white light gives better detail/clarity, but surely the key for sailors is the ability to recover quickly from the effects of light upon your night vision. Or am I (as is frequently the case) missing something?

Brad
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Old 18-12-2008, 08:33   #9
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An interesting opinion ...

Night Vision - The Red Myth
The link game me a bit of a laugh. I used to teach this stuff and the person writing the article would have well and truly failed Physiological optics.
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