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monitor color power consumption



 
 
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  #1  
Old December 9th 18, 12:56 AM posted to alt.windows7.general
Jean Fredette
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Posts: 47
Default monitor color power consumption

Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?
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  #2  
Old December 9th 18, 01:54 AM posted to alt.windows7.general
Rene Lamontagne
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Posts: 2,549
Default monitor color power consumption

On 12/08/2018 5:56 PM, Jean Fredette wrote:
Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?


Took out my trusty KILL-A-WATT-meter and did a test with standard
brightness on my ASUS MX279 27 inch monitor, after monitor had been on
all day.
Tested on black, white, grey, red, green, blue, cyan, magenta and yellow
All readings came out between 21.1 and 21.9 watts. So there is very
little difference in power consumption between colors.

Rene
  #3  
Old December 9th 18, 04:22 AM posted to alt.windows7.general
J. P. Gilliver (John)[_4_]
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Posts: 2,679
Default monitor color power consumption

In message , Rene Lamontagne
writes:
On 12/08/2018 5:56 PM, Jean Fredette wrote:
Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?


Took out my trusty KILL-A-WATT-meter and did a test with standard
brightness on my ASUS MX279 27 inch monitor, after monitor had been on
all day.
Tested on black, white, grey, red, green, blue, cyan, magenta and yellow
All readings came out between 21.1 and 21.9 watts. So there is very
little difference in power consumption between colors.

Rene


For a backlit monitor, i. e. virtually all these days, it will make
little difference - the backlight is more or less constant - the LCD
just lets through or blocks varying amounts of the light. (What it's
blocking presumably ends up as heat in the monitor - i. e. a black
screen will get hotter, though I don't think it will be that
noticeable.) The _consumption_ won't vary.

For CRT, plasma, and I suppose OLED (or any other _true_ LED, as opposed
to just LED backlight) display, then the more light, the more
consumption. I _suspect_ it wouldn't be _that_ noticeable for a CRT, as
the heater would be on all the time, but it should be _measurable_; more
for plasma and OLED (and true-LED, but that I think is only big outdoor
displays, and far from all of those).

I think there are some TVs which, although backlit, have a backlight
that is nevertheless divided into panels, and varied - i. e. the
backlight is a very low-res. version of the picture. I don't know if
that technology extended into computer monitors.

JPG


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  #4  
Old December 9th 18, 05:22 AM posted to alt.windows7.general
Sjouke Burry[_2_]
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Posts: 275
Default monitor color power consumption

On 9-12-2018 0:56, Jean Fredette wrote:
Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?

For old monitors and tv's (tube ones) black saves power. and
the screen will heat up less.
For flat screens:light gets blocked, so consumption is the same,
but a black screen will become hotter.
  #5  
Old December 9th 18, 06:47 AM posted to alt.windows7.general
Bill in Co[_3_]
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Posts: 303
Default monitor color power consumption

Sjouke Burry wrote:
On 9-12-2018 0:56, Jean Fredette wrote:
Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?

For old monitors and tv's (tube ones) black saves power. and
the screen will heat up less.
For flat screens:light gets blocked, so consumption is the same,
but a black screen will become hotter.


But I believe the difference is pretty negligible in any case, as I believe
was already mentioned in here. If someone has some references to counter
that, it would be interesting to see the documentation.


  #6  
Old December 9th 18, 06:48 AM posted to alt.windows7.general
Paul[_32_]
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Posts: 11,873
Default monitor color power consumption

J. P. Gilliver (John) wrote:
In message , Rene Lamontagne
writes:
On 12/08/2018 5:56 PM, Jean Fredette wrote:
Does the color of the monitor matter for power consumption?
Is black more or less than white in power consumption?
What about blue?


Took out my trusty KILL-A-WATT-meter and did a test with standard
brightness on my ASUS MX279 27 inch monitor, after monitor had been
on all day.
Tested on black, white, grey, red, green, blue, cyan, magenta and yellow
All readings came out between 21.1 and 21.9 watts. So there is very
little difference in power consumption between colors.

Rene


For a backlit monitor, i. e. virtually all these days, it will make
little difference - the backlight is more or less constant - the LCD
just lets through or blocks varying amounts of the light. (What it's
blocking presumably ends up as heat in the monitor - i. e. a black
screen will get hotter, though I don't think it will be that
noticeable.) The _consumption_ won't vary.

For CRT, plasma, and I suppose OLED (or any other _true_ LED, as opposed
to just LED backlight) display, then the more light, the more
consumption. I _suspect_ it wouldn't be _that_ noticeable for a CRT, as
the heater would be on all the time, but it should be _measurable_; more
for plasma and OLED (and true-LED, but that I think is only big outdoor
displays, and far from all of those).

I think there are some TVs which, although backlit, have a backlight
that is nevertheless divided into panels, and varied - i. e. the
backlight is a very low-res. version of the picture. I don't know if
that technology extended into computer monitors.

JPG


"the backlight is more or less constant"

Some of the monitors have a "Movie Mode" and dynamic contrast
setting in the OSD. What this does, is when a movie has a
dark scene in it, they turn down the LED backlight, to
attempt to get "better blacks".

This would make a slight temporary difference to the power.

Photoshop users *hate* that mode, because it throws off
color calibration. If you're any sort of Photoshop
user, one of the first settings you disable is
Dynamic Contrast in the new monitor (then the backlight
stays at constant power, once you've adjusted the
static level you want with the OSD slider).

There could also be some power usage which is proportional
to refresh rates, but on the cheap monitors I own, the
range of refresh rates is so small, it makes no difference
at all. There are some TN gamer monitors now, that run
somewhere around 144Hz max. Instead of the 60Hz that
a lot of commodity LCD monitors use. Those would be
good candidates for some "power tests", to see what
the proportionality is like.

Paul
 




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