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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
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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 |
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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 Ever been frustrated that you can't *disagree* with a petition? If so, visit 255soft.uk - and please pass it on, too. [UK only] -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf Just seen a Dyslexic Yorkshireman wearing a cat flap! |
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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. |
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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. |
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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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