Groups > alt.os.linux.mageia > #14207 > unrolled thread

Bad news for screen watchers especially if you prefer bright screens.

Started by	Bobbie Sellers <bliss@mouse-potato.com>
First post	2016-11-01 18:52 -0700
Last post	2016-11-04 09:44 +0100
Articles	20 on this page of 35 — 12 participants

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#14207 — Bad news for screen watchers especially if you prefer bright screens.

From	Bobbie Sellers <bliss@mouse-potato.com>
Date	2016-11-01 18:52 -0700
Subject	Bad news for screen watchers especially if you prefer bright screens.
Message-ID	<nvbgrd$poc$1@dont-email.me>

Hi guys and gals,

     Sad news but remediable.  Should be spread around...

<https://www.scientificamerican.com/article/blue-leds-light-up-your-brain/?WT.mc_id=SA_HLTH_20161101>

	DEA is going to be after this deleterious stimulant. ;^)

         bliss

-- 
bliss dash SF 4 ever at dslextreme dot com

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#14209

From	Doug Laidlaw <laidlaws@hotkey.net.au>
Date	2016-11-02 20:44 +1100
Message-ID	<c5poed-2oq.ln1@dougshost.douglaidlaw.net>
In reply to	#14207

On 02/11/16 12:52, Bobbie Sellers wrote:
> Hi guys and gals,
>
>     Sad news but remediable.  Should be spread around...
>
> <https://www.scientificamerican.com/article/blue-leds-light-up-your-brain/?WT.mc_id=SA_HLTH_20161101>
>
>
>     DEA is going to be after this deleterious stimulant. ;^)
>
>         bliss
>
It isn't just screens.  "White" incandescent globes emit light with a 
yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the modern 
automobile lighting are at the blue end.

Doug.
-- 
Mageia release 6 for x86_64 running 4.8.1-desktop-1.mga6 with DE=Xfce
I agree with no man's opinions.  I have some of my own.
    --Turgenev, "Fathers and Sons."

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#14212

From	Bobbie Sellers <bliss@mouse-potato.com>
Date	2016-11-02 06:23 -0700
Message-ID	<nvcpcd$426$1@dont-email.me>
In reply to	#14209

On 11/02/2016 02:44 AM, Doug Laidlaw wrote:
> On 02/11/16 12:52, Bobbie Sellers wrote:
>> Hi guys and gals,
>>
>>     Sad news but remediable.  Should be spread around...
>>
>> <https://www.scientificamerican.com/article/blue-leds-light-up-your-brain/?WT.mc_id=SA_HLTH_20161101>
>>
>>
>>
>>     DEA is going to be after this deleterious stimulant. ;^)
>>
>>         bliss
>>
> It isn't just screens.  "White" incandescent globes emit light with a
> yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the modern
> automobile lighting are at the blue end.
>
> Doug.

	Some people are required by the needs of study or occupation these days 
to spend a lot of time looking at screens.  This is basically
a problem for the indulgent parent who must deal with the effects of
late evening exposure to the tablet screens.  Most workers in the IT
field have pretty much enough exposure at work.
	No one is going to be staring at the new LED headlights.
	The yellow tinge of incandescent bulbs does not have the
same effect as the blue-white of the LED.
	You do not seem to have read the article.  On my notebook I have
messed with the settings in display hardware to alter the gamma and 
today have a faintly pink screen.
	The f.lux software varies the screen color from whiter to redder
throughout the day and can be set for night workers in the opposite
direction(white in the evening and redder after dawn).  Some Linux 
version have f.lux in the repositories.
	
	bliss

-- 
bliss dash SF 4 ever at dslextreme dot com

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#14214

From	The Real Bev <bashley101@gmail.com>
Date	2016-11-02 10:16 -0700
Message-ID	<nvd700$llh$2@dont-email.me>
In reply to	#14209

On 11/02/2016 02:44 AM, Doug Laidlaw wrote:
> On 02/11/16 12:52, Bobbie Sellers wrote:
>> Hi guys and gals,
>>
>>     Sad news but remediable.  Should be spread around...
>>
>> <https://www.scientificamerican.com/article/blue-leds-light-up-your-brain/?WT.mc_id=SA_HLTH_20161101>
>>
>>
>>     DEA is going to be after this deleterious stimulant. ;^)
>>
>>         bliss
>>
> It isn't just screens.  "White" incandescent globes emit light with a
> yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the modern
> automobile lighting are at the blue end.

I had wondered about people selling yellowish "gaming glasses".  Is this 
possibly what they're for?

-- 
Cheers, Bev
   "The federal government has taken too much tax money from the
    people, too much authority from the states, and too much liberty
    with the Constitution."                         -- Ronald Reagan

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#14219

From	Moe Trin <ibuprofin@painkiller.example.tld.invalid>
Date	2016-11-03 00:19 +0000
Message-ID	<slrno1l0lr.n1s.ibuprofin@planck.phx.az.us>
In reply to	#14214

On Wed, 2 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
<nvd700$llh$2@dont-email.me>, The Real Bev wrote:

>Doug Laidlaw wrote:

>> Bobbie Sellers wrote:

>>>     Sad news but remediable.  Should be spread around...

>> It isn't just screens.  "White" incandescent globes emit light with
>> a yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the
>> modern automobile lighting are at the blue end.

>I had wondered about people selling yellowish "gaming glasses".  Is
>this possibly what they're for?

Nah - that's to protect your eyes from those alien ray-guns that the
bad guys are using   ;-)

Actually, for many years, competitive target shooters (using real guns
on outdoor ranges) MAY wear yellow tinted glasses (safety glasses if
you're smart), but that is to increase the contrast of the black rings
on the white paper target.  (You may notice that traffic warning signs
are black on yellow rather than black on white, so that they can be
seen better - same rational.)   I think I got my first pair of yellow
shooting glasses in 1955 or so.   You need to be wearing a hat with a
large bill (or equal) to keep the sun out of the way though.   Yellow
tinted glasses and bright sunlight don't work well together.

        Old guy

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#14224

From	The Real Bev <bashley101@gmail.com>
Date	2016-11-02 23:46 -0700
Message-ID	<nvemfo$14f$1@dont-email.me>
In reply to	#14219

On 11/02/2016 05:19 PM, Moe Trin wrote:
> On Wed, 2 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
> <nvd700$llh$2@dont-email.me>, The Real Bev wrote:
>
>>Doug Laidlaw wrote:
>
>>> Bobbie Sellers wrote:
>
>>>>     Sad news but remediable.  Should be spread around...
>
>>> It isn't just screens.  "White" incandescent globes emit light with
>>> a yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the
>>> modern automobile lighting are at the blue end.
>
>>I had wondered about people selling yellowish "gaming glasses".  Is
>>this possibly what they're for?
>
> Nah - that's to protect your eyes from those alien ray-guns that the
> bad guys are using   ;-)
>
> Actually, for many years, competitive target shooters (using real guns
> on outdoor ranges) MAY wear yellow tinted glasses (safety glasses if
> you're smart), but that is to increase the contrast of the black rings
> on the white paper target.  (You may notice that traffic warning signs
> are black on yellow rather than black on white, so that they can be
> seen better - same rational.)   I think I got my first pair of yellow
> shooting glasses in 1955 or so.   You need to be wearing a hat with a
> large bill (or equal) to keep the sun out of the way though.   Yellow
> tinted glasses and bright sunlight don't work well together.

My ski goggles are light yellow, and after a while the snow looks white 
again through them.  Even though I only ski in bright sunlight, I've 
never noticed excessive brightness until I take the goggles off.

I just buy them at yard sales for a buck -- the previous owner got to 
choose he color.

-- 
Cheers, Bev
    "In a closed society where everybody's guilty, the only crime
     is getting caught. In a world of thieves, the only final sin
     is stupidity."                              -- H.S. Thompson

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#14225

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2016-11-03 07:07 +0000
Message-ID	<nvennk$2o7$1@news.albasani.net>
In reply to	#14224

On 03/11/16 06:46, The Real Bev wrote:
> My ski goggles are light yellow, and after a while the snow looks white
> again through them.  Even though I only ski in bright sunlight, I've
> never noticed excessive brightness until I take the goggles off.
>

IN the days of B & W photography, yellow or green filters were used to 
darken blue skies, in particular to increase contrast with white clouds, 
which stayed lighter.

I suspect the same is true of white snow and blue sky.,

-- 
You can get much farther with a kind word and a gun than you can with a 
kind word alone.

Al Capone

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#14249

From	The Real Bev <bashley101@gmail.com>
Date	2016-11-03 21:49 -0700
Message-ID	<nvh3vo$848$1@dont-email.me>
In reply to	#14225

On 11/03/2016 12:07 AM, The Natural Philosopher wrote:
> On 03/11/16 06:46, The Real Bev wrote:
>> My ski goggles are light yellow, and after a while the snow looks white
>> again through them.  Even though I only ski in bright sunlight, I've
>> never noticed excessive brightness until I take the goggles off.
>
> IN the days of B & W photography, yellow or green filters were used to
> darken blue skies, in particular to increase contrast with white clouds,
> which stayed lighter.

RED filters.  The effect was unnatural, but very slick.

> I suspect the same is true of white snow and blue sky.,

Theory has it that the eye is more sensitive to yellow light because of 
our yellow sun.

-- 
Cheers, Bev
   "They redundantly repeated themselves over and over again
    incessantly without end ad infinitum" -- ibid.

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#14254

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2016-11-04 05:42 +0000
Message-ID	<nvh73f$csv$1@news.albasani.net>
In reply to	#14249

On 04/11/16 04:49, The Real Bev wrote:
> On 11/03/2016 12:07 AM, The Natural Philosopher wrote:
>> On 03/11/16 06:46, The Real Bev wrote:
>>> My ski goggles are light yellow, and after a while the snow looks white
>>> again through them.  Even though I only ski in bright sunlight, I've
>>> never noticed excessive brightness until I take the goggles off.
>>
>> IN the days of B & W photography, yellow or green filters were used to
>> darken blue skies, in particular to increase contrast with white clouds,
>> which stayed lighter.
>
> RED filters.  The effect was unnatural, but very slick.

Red made things VERY contrasty.
Yellow or green was a lot better - more like a polarising filter.


>
>> I suspect the same is true of white snow and blue sky.,
>
> Theory has it that the eye is more sensitive to yellow light because of
> our yellow sun.
>


-- 
"Corbyn talks about equality, justice, opportunity, health care, peace, 
community, compassion, investment, security, housing...."
"What kind of person is not interested in those things?"

"Jeremy Corbyn?"

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#14256

From	William Unruh <unruh@invalid.ca>
Date	2016-11-04 09:41 +0000
Message-ID	<nvhl4d$kqr$1@dont-email.me>
In reply to	#14249

On 2016-11-04, The Real Bev <bashley101@gmail.com> wrote:
> On 11/03/2016 12:07 AM, The Natural Philosopher wrote:
>> On 03/11/16 06:46, The Real Bev wrote:
>>> My ski goggles are light yellow, and after a while the snow looks white
>>> again through them.  Even though I only ski in bright sunlight, I've
>>> never noticed excessive brightness until I take the goggles off.
>>
>> IN the days of B & W photography, yellow or green filters were used to
>> darken blue skies, in particular to increase contrast with white clouds,
>> which stayed lighter.
>
> RED filters.  The effect was unnatural, but very slick.
>
>> I suspect the same is true of white snow and blue sky.,
>
> Theory has it that the eye is more sensitive to yellow light because of 
> our yellow sun.

More likely because the visible band is what water is transparent at,
and eyes developed underwater and are filled with water.


>

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#14257

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2016-11-04 10:00 +0000
Message-ID	<nvhm8j$8gb$2@news.albasani.net>
In reply to	#14256

On 04/11/16 09:41, William Unruh wrote:
> On 2016-11-04, The Real Bev <bashley101@gmail.com> wrote:
>> On 11/03/2016 12:07 AM, The Natural Philosopher wrote:
>>> On 03/11/16 06:46, The Real Bev wrote:
>>>> My ski goggles are light yellow, and after a while the snow looks white
>>>> again through them.  Even though I only ski in bright sunlight, I've
>>>> never noticed excessive brightness until I take the goggles off.
>>>
>>> IN the days of B & W photography, yellow or green filters were used to
>>> darken blue skies, in particular to increase contrast with white clouds,
>>> which stayed lighter.
>>
>> RED filters.  The effect was unnatural, but very slick.
>>
>>> I suspect the same is true of white snow and blue sky.,
>>
>> Theory has it that the eye is more sensitive to yellow light because of
>> our yellow sun.
>
> More likely because the visible band is what water is transparent at,
> and eyes developed underwater and are filled with water.
>
ISTR that eyes developed more than once.

Insects are particularly happy with UV.


>
>>


-- 
To ban Christmas, simply give turkeys the vote.

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#14243

From	Moe Trin <ibuprofin@painkiller.example.tld.invalid>
Date	2016-11-03 20:12 +0000
Message-ID	<slrno1n6i3.s5a.ibuprofin@planck.phx.az.us>
In reply to	#14224

On Wed, 2 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
<nvemfo$14f$1@dont-email.me>, The Real Bev wrote:

>Moe Trin wrote:

>> Actually, for many years, competitive target shooters [...] MAY wear
>> yellow tinted glasses [...] but that is to increase the contrast of
>> the black rings on the white paper target. [...]   I think I got my
>> first pair of yellow shooting glasses in 1955 or so.   You need to
>> be wearing a hat with a large bill (or equal) to keep the sun out of
>> the way though.   Yellow tinted glasses and bright sunlight don't
>> work well together.

>My ski goggles are light yellow, and after a while the snow looks white 
>again through them.  Even though I only ski in bright sunlight, I've 
>never noticed excessive brightness until I take the goggles off.

Main problem I've noticed is when you either take them off, or get a
glimpse of the sun around the glasses - especially with older eyes, it
takes some time for the eyes to readjust to the light levels.

>I just buy them at yard sales for a buck -- the previous owner got to 
>choose he color.

All of mine are prescription (and hardened), so they are made to order
and cost a bit more.

        Old guy

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#14232

From	TJ <TJ@noneofyour.business>
Date	2016-11-03 08:47 -0400
Message-ID	<nvfbjp$58u$1@dont-email.me>
In reply to	#14219

On 11/02/2016 08:19 PM, Moe Trin wrote:
> On Wed, 2 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
> <nvd700$llh$2@dont-email.me>, The Real Bev wrote:
>
>> Doug Laidlaw wrote:
>
>>> Bobbie Sellers wrote:
>
>>>>     Sad news but remediable.  Should be spread around...
>
>>> It isn't just screens.  "White" incandescent globes emit light with
>>> a yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the
>>> modern automobile lighting are at the blue end.
>
>> I had wondered about people selling yellowish "gaming glasses".  Is
>> this possibly what they're for?
>
> Nah - that's to protect your eyes from those alien ray-guns that the
> bad guys are using   ;-)
>
> Actually, for many years, competitive target shooters (using real guns
> on outdoor ranges) MAY wear yellow tinted glasses (safety glasses if
> you're smart), but that is to increase the contrast of the black rings
> on the white paper target.  (You may notice that traffic warning signs
> are black on yellow rather than black on white, so that they can be
> seen better - same rational.)   I think I got my first pair of yellow
> shooting glasses in 1955 or so.   You need to be wearing a hat with a
> large bill (or equal) to keep the sun out of the way though.   Yellow
> tinted glasses and bright sunlight don't work well together.
>
>         Old guy
>
My brother likes to wear yellow-tinted glasses when tractor-cultivating 
young corn where other weed control measures have been less than 
successful. He says they make the corn stand out from the weeds.

TJ

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#14244

From	Moe Trin <ibuprofin@painkiller.example.tld.invalid>
Date	2016-11-03 20:14 +0000
Message-ID	<slrno1n6le.s5a.ibuprofin@planck.phx.az.us>
In reply to	#14232

On Thu, 3 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
<nvfbjp$58u$1@dont-email.me>, TJ wrote:

>Moe Trin wrote:

>> Actually, for many years, competitive target shooters [...] MAY wear
>> yellow tinted glasses [...], but that is to increase the contrast of
>> the black rings on the white paper target.

>My brother likes to wear yellow-tinted glasses when tractor-cultivating 
>young corn where other weed control measures have been less than 
>successful. He says they make the corn stand out from the weeds.

Similar here, with weeds in the lawn.  We can't use chemical weed
control agents in the lawn for most of the year, because the average
temperatures are well above the limits listed on the labels.  See
http://www.public.asu.edu/~aunjs/ClimateofPhoenix/wxpart1.htm  (section
IV).  If you look at the label on products like "Weed-Be-Gone" or "Weed
Stop for Lawns", you'll find that they shouldn't be used when temps
average above 85F/29C or 90F/32C), and the overnight _low_ in July may
be above that, never mind the average.  That means weed control the
old-fashioned way - feeding and watering to create a dense lawn (not
possible here) to crowd out the weeks, or walking the lawn and pulling
the weeds manually.  Most weeds are easy to see, but some (such as
oxalis) are similar in color (but not texture) until they bloom.   Of
course, the other alternative is no lawn (my front and side yards are
light colored crushed stone), or artificial grass.

        Old guy

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#14250

From	The Real Bev <bashley101@gmail.com>
Date	2016-11-03 21:50 -0700
Message-ID	<nvh42g$848$2@dont-email.me>
In reply to	#14232

On 11/03/2016 05:47 AM, TJ wrote:
> On 11/02/2016 08:19 PM, Moe Trin wrote:
>> On Wed, 2 Nov 2016, in the Usenet newsgroup alt.os.linux.mageia, in article
>> <nvd700$llh$2@dont-email.me>, The Real Bev wrote:
>>
>>> Doug Laidlaw wrote:
>>
>>>> Bobbie Sellers wrote:
>>
>>>>>     Sad news but remediable.  Should be spread around...
>>
>>>> It isn't just screens.  "White" incandescent globes emit light with
>>>> a yellow tinge.  "Whuite" LEDs in torches (flashlights) and in the
>>>> modern automobile lighting are at the blue end.
>>
>>> I had wondered about people selling yellowish "gaming glasses".  Is
>>> this possibly what they're for?
>>
>> Nah - that's to protect your eyes from those alien ray-guns that the
>> bad guys are using   ;-)
>>
>> Actually, for many years, competitive target shooters (using real guns
>> on outdoor ranges) MAY wear yellow tinted glasses (safety glasses if
>> you're smart), but that is to increase the contrast of the black rings
>> on the white paper target.  (You may notice that traffic warning signs
>> are black on yellow rather than black on white, so that they can be
>> seen better - same rational.)   I think I got my first pair of yellow
>> shooting glasses in 1955 or so.   You need to be wearing a hat with a
>> large bill (or equal) to keep the sun out of the way though.   Yellow
>> tinted glasses and bright sunlight don't work well together.
>>
>>         Old guy
>>
> My brother likes to wear yellow-tinted glasses when tractor-cultivating
> young corn where other weed control measures have been less than
> successful. He says they make the corn stand out from the weeds.

Orange glasses REALLY make green stand out.  Creepily so.



-- 
Cheers, Bev
   "They redundantly repeated themselves over and over again
    incessantly without end ad infinitum" -- ibid.

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#14218

From	Moe Trin <ibuprofin@painkiller.example.tld.invalid>
Date	2016-11-03 00:18 +0000
Message-ID	<slrno1l0j6.n1s.ibuprofin@planck.phx.az.us>
In reply to	#14209

On Wed, 2 Nov 2016  in the Usenet newsgroup alt.os.linux.mageia, in article
<c5poed-2oq.ln1@dougshost.douglaidlaw.net>, Doug Laidlaw wrote:

>Bobbie Sellers wrote:

>>     Sad news but remediable.  Should be spread around...

Actually, several of the flat-panel monitors on the desktops here have
a setup menu that includes a 'color' feature - this HP2009M lets me
set the illumination to 9300K, 6500K, "sRBG" and a "custom" setting.
The Acer is somewhat similar, as is the LG.

>It isn't just screens.  "White" incandescent globes emit light with a 
>yellow tinge.

That's the nature of the beast - if you look at the wonky-pedia page
(https://en.wikipedia.org/wiki/Color_temperature), MOST incandescent
lamps are somewhere in the range of 2400-2600K.

>"Whuite" LEDs

I presume that to be a typ0

>in torches (flashlights)

because they tend to be under-powered - the "standard" torch (two NEDA
type 13AX - a.k.a. "D" cells and a PR-2 lamp) is nominal 1.5 watts, and
0.8 mean spherical candle power - which ain't a whole lot of lumens (if
I recall correctly, a "good" flashlight might have a peak 100 lumens in
the center of a vary narrow beam).  The LED replacement may be similar
in light levels, but is 0.063 watts because the coin-cell batteries
aren't especially powerful.     Again, looking at the wonky-pedia page
above, the light from a 5000-6500K source APPEARS brighter - meaning
you can see better with the same number of lumens.

>and in the modern automobile lighting are at the blue end.

Again, more APPARENT light for the bux.  We just replaced the lamp
over the kitchen sink - we had a 3x40W track light, and it's now a
General Electric "under counter" fluorescent replacement (model 33847,
24 inch/61 cm 823 lumen LED lamp using 9 watts on "high" setting (800
lumens is about a 60 watt incandescent).  The fascinating feature of
this particular lamp is the three position (electrical) switch is NOT
the "off/low/high" power switch (this one uses a motion sensor - wave
your hand under one side of the lamp, and it sets off/low/high), but
rather sets the color temperature (choice of Warm-White, Cool White and
Daylight).  Playing with that switch DOESN'T change the amount of power
used, so I'm guessing it's two or three sets of LEDs hidden behind the
diffuser.  Certainly was not cheap (US$50).  With the energy saved, it
will pay for itself in ten or twenty years   ;-)    Oh, and using my
50 year old Weston Master IV (photographic) light meter, the "low"
light setting is about a quarter of the "high" (guessing 200 lumens(
and the power used doesn't even show on my "Kill-a-Watt" power meter
(less than 2 watts), but the light level is more than adequate for
casual lighting (i.e. not doing the dishes, or similar).

Incandescent lamps are getting harder to find here - if you go to the
lamp section of the hardware or home-improvement store, it's just
wall-to-wall compact-fluorescent-lamps and the more expensive LED lamps
(choice of Warm-White, Cool White and Daylight lamps in 15 to 150 watt
equivalent sizes) and maybe a dozen (total) incandescents (appliance
and reading lamps mainly).  Problem is that incandescents will operate
over -50 to +60 C (-60 to +140F) or more, while the CFL and LED types
have electronics in them, and should be restricted to 0 to +40C max
(32 to 104F) which can be a problem outside here.  But then, even the
regular (full sized) fluorescent tubes have temperature limits,
especially on the low side.

        Old guy

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#14222

From	Charlie Gibbs <cgibbs@kltpzyxm.invalid>
Date	2016-11-03 03:44 +0000
Message-ID	<nvebqe0ljs@news4.newsguy.com>
In reply to	#14218

On 2016-11-03, Moe Trin <ibuprofin@painkiller.example.tld.invalid> wrote:

> On Wed, 2 Nov 2016  in the Usenet newsgroup alt.os.linux.mageia, in article
> <c5poed-2oq.ln1@dougshost.douglaidlaw.net>, Doug Laidlaw wrote:
>
>> Bobbie Sellers wrote:
>
>>>     Sad news but remediable.  Should be spread around...
>
> Actually, several of the flat-panel monitors on the desktops here have
> a setup menu that includes a 'color' feature - this HP2009M lets me
> set the illumination to 9300K, 6500K, "sRBG" and a "custom" setting.
> The Acer is somewhat similar, as is the LG.
>
>> It isn't just screens.  "White" incandescent globes emit light with a 
>> yellow tinge.
>
> That's the nature of the beast - if you look at the wonky-pedia page
> (https://en.wikipedia.org/wiki/Color_temperature), MOST incandescent
> lamps are somewhere in the range of 2400-2600K.

I've been phasing in LED replacements for the 50-watt PAR20 halogens
in our pot lights.  (They consume about 7 watts for the same amount
of light, and don't get hellishly hot like the halogens.)  The 2700K
models (warm white) work pretty well.  At least until you dim them.
The newer ones will dim decently without flickering, but they don't
get redder like the halogens do.  This is a bit disconcerting,
especially if you have one of each on the same circuit.

-- 
/~\  cgibbs@kltpzyxm.invalid (Charlie Gibbs)
\ /  I'm really at ac.dekanfrus if you read it the right way.
 X   Top-posted messages will probably be ignored.  See RFC1855.
/ \  HTML will DEFINITELY be ignored.  Join the ASCII ribbon campaign!

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#14283

From	"J. Clarke" <j.clarke.873638@gmail.com>
Date	2016-11-06 18:42 -0500
Message-ID	<MPG.328989f6d0a4517398a632@news.eternal-september.org>
In reply to	#14222

In article <nvebqe0ljs@news4.newsguy.com>, 
cgibbs@kltpzyxm.invalid says...
> 
> On 2016-11-03, Moe Trin <ibuprofin@painkiller.example.tld.invalid> wrote:
> 
> > On Wed, 2 Nov 2016  in the Usenet newsgroup alt.os.linux.mageia, in article
> > <c5poed-2oq.ln1@dougshost.douglaidlaw.net>, Doug Laidlaw wrote:
> >
> >> Bobbie Sellers wrote:
> >
> >>>     Sad news but remediable.  Should be spread around...
> >
> > Actually, several of the flat-panel monitors on the desktops here have
> > a setup menu that includes a 'color' feature - this HP2009M lets me
> > set the illumination to 9300K, 6500K, "sRBG" and a "custom" setting.
> > The Acer is somewhat similar, as is the LG.
> >
> >> It isn't just screens.  "White" incandescent globes emit light with a 
> >> yellow tinge.
> >
> > That's the nature of the beast - if you look at the wonky-pedia page
> > (https://en.wikipedia.org/wiki/Color_temperature), MOST incandescent
> > lamps are somewhere in the range of 2400-2600K.
> 
> I've been phasing in LED replacements for the 50-watt PAR20 halogens
> in our pot lights.  (They consume about 7 watts for the same amount
> of light, and don't get hellishly hot like the halogens.)  The 2700K
> models (warm white) work pretty well.  At least until you dim them.
> The newer ones will dim decently without flickering, but they don't
> get redder like the halogens do.  This is a bit disconcerting,
> especially if you have one of each on the same circuit.

The latest generation of LED bulbs from Philips 
does a pretty job of emulating the reddening of 
incandescents.  It's not perfect but it's good 
enough.  Now the question is what I do with the 
two in the chandelier that don't do that (I've 
been replacing them on an attrition basis).

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#14286

From	The Natural Philosopher <tnp@invalid.invalid>
Date	2016-11-07 08:01 +0000
Message-ID	<nvpcc0$mit$7@news.albasani.net>
In reply to	#14283

On 06/11/16 23:42, J. Clarke wrote:
> Now the question is what I do with the
> two in the chandelier that don't do that (I've
> been replacing them on an attrition basis).

Exchange them with ones that are in silly places - the light in the 
cupboard etc.


-- 
“It is hard to imagine a more stupid decision or more dangerous way of 
making decisions than by putting those decisions in the hands of people 
who pay no price for being wrong.”

Thomas Sowell

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#14211

From	TJ <TJ@noneofyour.business>
Date	2016-11-02 08:38 -0400
Message-ID	<nvcmmj$pv8$1@dont-email.me>
In reply to	#14207

On 11/01/2016 09:52 PM, Bobbie Sellers wrote:
> Hi guys and gals,
>
>     Sad news but remediable.  Should be spread around...
>
> <https://www.scientificamerican.com/article/blue-leds-light-up-your-brain/?WT.mc_id=SA_HLTH_20161101>
>
>
>     DEA is going to be after this deleterious stimulant. ;^)
>
>         bliss
>
Oh, great. Now I'll have even MORE trouble staying awake through a prime 
time TV program.

These people who have so much trouble falling asleep at night should try 
doing a little physical labor once in a while. Believe me, after a day 
of that, a couple of blue lights aren't going to stop you from sleeping.

TJ

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csiph-web

Bad news for screen watchers especially if you prefer bright screens.

Contents

#14207 — Bad news for screen watchers especially if you prefer bright screens.

#14209

#14212

#14214

#14219

#14224

#14225

#14249

#14254

#14256

#14257

#14243

#14232

#14244

#14250

#14218

#14222

#14283

#14286

#14211