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Old 21st November 2012, 07:13 PM   #151
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Astronomers use red flashlights as well. Accommodation from red light goes faster, as one of them explained.
Doe submariners use red as well?
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Old 21st November 2012, 07:27 PM   #152
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Doe submariners use red as well?
Yes, according to movies.
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Old 21st November 2012, 07:35 PM   #153
Pano is offline Pano  United States
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I wonder why? Who would see the light from inside a submarine? Maybe it's just a Hollywood thing.
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Old 21st November 2012, 07:39 PM   #154
rsavas is offline rsavas  Canada
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How was the standardization in the early years of fluorescent lighting?
My guess is that it took a long time before standardization had taken place.

Yes, this seems to always be the case.
Even now we hare having problems with T8 lamp standardization. The lamp mfg's are coming out with new energy saving lamps, that do not follow the documented standards such as ANSI & IEC nor are they making public the specific requirements of the very products that they are introducing into the market place = a bit of a mess.
CFL is poor FL lamp technology. Much of the light is trapped within and can not escape= low lumen/W. The newer US Energy Star requirements are asking for efficiencies that are not capable of being met with CFL lamps, so LED's will replace CFL very shortly, for these reasons. There will be sorting out of LED efficiancies in a simlar manner in years to come. The US DOE are also clamping down on the main stray of linear FL lamps as well, introducing ballast/driver efficiency standards to take place Nov 2014. We are having to re-design a significant amount of the existing products, phase others out, in order to meet these new requirements. All this means is that costs to the end user will rise and weed out poor performers. The ? remains, how in the heck are they, DOE, to regulate & enforce mfg's to comply in there product production, in an on going basis?
Good information folks, thanks
Rick
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Old 21st November 2012, 07:42 PM   #155
rsavas is offline rsavas  Canada
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I wonder why? Who would see the light from inside a submarine? Maybe it's just a Hollywood thing.
What, no Navy personel aboard this ship!!
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Old 21st November 2012, 07:43 PM   #156
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I wonder why? Who would see the light from inside a submarine? Maybe it's just a Hollywood thing.
May be it is Hollywood thing, but they did that at night. At day they used ordinary white light. Makes sense.
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Old 21st November 2012, 07:44 PM   #157
Pano is offline Pano  United States
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So they don't get blinded when they look out the windows at night?
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Old 21st November 2012, 07:47 PM   #158
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So they don't get blinded when they look out the windows at night?
Yes, when they go on surface and climb outside.

http://www.amazon.com/Das-Boot-The-D.../dp/0767802470
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Old 21st November 2012, 07:58 PM   #159
GaryB is offline GaryB  United States
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I still say LED's are a scam due to cost/lumen!!
Rick,
If you don't like the cost/lumen of LEDs, wait a few years. LED manufacturers are following their own version of Moore's law, which they call Haitz' Law. See Haitz' Law
It says that the efficiency of LEDs and the cost drops by a factor of 10 every 10 years. So far the industry seems on track to continue that trend for quite a while.

---Gary
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Old 21st November 2012, 08:29 PM   #160
rsavas is offline rsavas  Canada
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Hi Gary,
Thx, amazing, I am learning my lighting trade on an audio forum.
Yes, the ole LED has come a long way from the T1-3/4 style. Still a long way to go compared to a 54W T5HO 4700 lumen for $5
Cheers Rick
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