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RobReads
I heard in a news report a while back that LED TV screens would use a lot less energy that any TV made so far. Now I see them on the market, but the ads don't stress this. Are they significantly more energy efficient?
We still have the old kind of TV (pre-flat screen), would the LED use significantly less electricity?
Answer
No - unless ...
Once a CRT (Cathode Ray Tube) or tube type TV is turned on, that's it's big draw. Once fired up, and in use, it takes a small amount of energy to keep it going. If you turn it on and off, and on and off again, repeatedly, then it will soon get less efficient.
LCD LED TVs use less energy to start up, and are more efficient that flashlights that use incandescent wire (bulbs), but similar technology to fluorescent lights keep most of the CRT TVs more efficient than the LCD TVs.
-Russ
No - unless ...
Once a CRT (Cathode Ray Tube) or tube type TV is turned on, that's it's big draw. Once fired up, and in use, it takes a small amount of energy to keep it going. If you turn it on and off, and on and off again, repeatedly, then it will soon get less efficient.
LCD LED TVs use less energy to start up, and are more efficient that flashlights that use incandescent wire (bulbs), but similar technology to fluorescent lights keep most of the CRT TVs more efficient than the LCD TVs.
-Russ
Are LED Screen TVs really more energy efficient?
RobReads
I heard in a news report a while back that LED TV screens would use a lot less energy that any TV made so far. Now I see them on the market, but the ads don't stress this. Are they significantly more energy efficient?
Answer
Generally, if other things were comparable, an LED TV is more efficient than an LCD, and they are both better than CRT tvs. There is no true "LED" tv yet - they are LCD tvs that use an LED backlight. Still they gain a little efficiency.
The problem in comparison happens because there are so many variables.
Each generation of TV has a revised set of power settings - from basic brightness to "ambient light settings" and the power drawn when the device is off or in "standby". Even if we compare two similar 40" flat screen televisions, if I have mine set for maximum brightness and crank up the color levels, my TV will use 15-30% more energy than one that is tuned for efficiency.
If my TV has twice as many pixels, or I have a higher refresh rate.. then I use more energy again.
Since the newer TVs are the only ones using the LED technology, these same new TVs are likely to be "hi-def" (more pixels 720p, 1080p etc.. ), and higher refresh rates ( 60hz. 120 hz, etc..) - the comparisons are not true "apples-to-apples" comparisons.
If you could find a group of machines that had all the other features the same.. or at least very close.. the LED backlight vs the LCD backlight should save about 10% (per IEA.org link).
You might save almost that much just by unplugging the set when not in use.
Right now, only the small OLED screens we see on cell phones are true LED.
Unless you spend real $$$, true LED tv won't be available for several years yet.
(see last few links, engaget, sony, lg)
Generally, if other things were comparable, an LED TV is more efficient than an LCD, and they are both better than CRT tvs. There is no true "LED" tv yet - they are LCD tvs that use an LED backlight. Still they gain a little efficiency.
The problem in comparison happens because there are so many variables.
Each generation of TV has a revised set of power settings - from basic brightness to "ambient light settings" and the power drawn when the device is off or in "standby". Even if we compare two similar 40" flat screen televisions, if I have mine set for maximum brightness and crank up the color levels, my TV will use 15-30% more energy than one that is tuned for efficiency.
If my TV has twice as many pixels, or I have a higher refresh rate.. then I use more energy again.
Since the newer TVs are the only ones using the LED technology, these same new TVs are likely to be "hi-def" (more pixels 720p, 1080p etc.. ), and higher refresh rates ( 60hz. 120 hz, etc..) - the comparisons are not true "apples-to-apples" comparisons.
If you could find a group of machines that had all the other features the same.. or at least very close.. the LED backlight vs the LCD backlight should save about 10% (per IEA.org link).
You might save almost that much just by unplugging the set when not in use.
Right now, only the small OLED screens we see on cell phones are true LED.
Unless you spend real $$$, true LED tv won't be available for several years yet.
(see last few links, engaget, sony, lg)
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Title Post: Are LED Screen TVs really more energy efficient?
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Author: Yukie
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