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Old 03-21-2008, 06:30 AM   #1
Anhslaught Anhslaught is offline
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Default Energy Consumpution: LCD, Plasma, CRT, Projector

So....title.

In general, what wastes more energy? LCD, Plasma, CRT, or Projectors?
Rank from least to most.

I'm just wondering because my brother came into my room. I had my LCD on and he was saying, "this TV is hecka hot!". Honestly....I feel the heat but it wasn't THAT hot.

So I said, "Well its not as hot as the CRT I gave you and it saves more electricity." He says, "I don't like your TV". I'm like, "ok......"
His projector is a lot hotter than my TV, when sitting next to it, you can feel the heat blowing in your face. So I was just wondering, if Projectors waste a lot of energy, or is it just hot air?
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Old 03-21-2008, 07:18 AM   #2
snoborder351 snoborder351 is offline
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I know my Plasma uses more energy than my old tube tv. Sure it was a 20" POS tv but that's beside the point.

I know it uses more energy because my electric bill is about $10 more than it was last year and the only thing that has changed is the TV. Sure it uses more electricity and I'm probably killing some animal somewhere because of it but it is totally worth it to see Lost in HD...
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Old 03-22-2008, 02:19 PM   #3
ryoohki ryoohki is offline
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I know that projector use between 130 and 210W of power depending on the model, the lamp etc.. there's too many factors....
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Old 03-22-2008, 06:16 PM   #4
WickyWoo WickyWoo is offline
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Plasma far and away uses more power

42" set is 400w

Projection uses 160-200w

LCD typically in the mid-high 2s
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Old 03-22-2008, 07:02 PM   #5
ManUtd ManUtd is offline
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I just checked my 60" plasma and it is 536W while the 65" Sharp LCD is 525W. So LCD is definitely more effiicient.
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Old 03-23-2008, 05:06 AM   #6
syncguy syncguy is offline
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Plasmas switch high voltages (could be about 200 volts) while LCDs switch low voltages (about 12 volts). Hence, plasma definitely consumes more energy than LCD. They generate more heat and they are heavier as well.

In case of projectors, the main component that consumes energy is the lamp. The size of the lamp could vary depending on the projector. Generally, this could vary from about 150 to 200 watts. Some projectors could have high power lamps. e.g. 400W Xenon lamp of VW200.

So it is likely that the projectors are close to plasmas while LCD energy consumption is relatively low.

CRT energy consumption should be lower than plasmas/projectors and are close to LCDs.
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Old 03-23-2008, 10:24 PM   #7
Anhslaught Anhslaught is offline
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Oh cool nice to know. So in general from High to low, its Plasmas, Projectors, CRT, then LCD.

I actually didnt know CRT was that close to LCD, always thought that they were even more energy consuming than Plasmas.

Thanks for the info guys.
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Old 03-24-2008, 12:49 AM   #8
WickyWoo WickyWoo is offline
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LCD comes after Plasma. Volts and Watts are 2 different things

Plasma, LCD, projector, CRT
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Old 03-24-2008, 05:02 AM   #9
syncguy syncguy is offline
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LCDs have a backlight and this consumes power in addition to switching low voltage LCD panel. However, I did not think that LCD would consume more power than projectors as the projectors also have an intense lamp (in addition to panels), in some cases the lamp could be high wattage. This is my feeling. I do not have any stats.

It is interesting to see some stats on this.
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Old 03-24-2008, 07:41 PM   #10
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Les not forget the mighty DLP
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Old 03-26-2008, 02:10 AM   #11
syncguy syncguy is offline
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Quote:
Originally Posted by BigBLUballz View Post
Les not forget the mighty DLP
I am not sure where DLP will sit. It is interesting to find out whether switching DLP panels would take more energy than LCD (or vice versa). I expect that the lamps of DLP and LCD projectors are close in energy consumption.
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Old 03-27-2008, 07:14 AM   #12
Anhslaught Anhslaught is offline
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I kinda figured DLP and LCD would be the same is it not? I actually don't know the difference between the 2. Rear projection TV's are LCDs too arent they? I'm not too sure what the differnce between a Rear Projection and a DLP is to be honest.

So now we got DLP, Plasma, CRT, Projectors, Rear Projectors and LCDs?

Hmmmmmmmmmm.....
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Old 03-27-2008, 09:11 AM   #13
syncguy syncguy is offline
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Quote:
Originally Posted by Anhslaught View Post
I kinda figured DLP and LCD would be the same is it not? I actually don't know the difference between the 2. Rear projection TV's are LCDs too arent they? I'm not too sure what the differnce between a Rear Projection and a DLP is to be honest.

So now we got DLP, Plasma, CRT, Projectors, Rear Projectors and LCDs?

Hmmmmmmmmmm.....
RPTV could be LCD, DLP, LCOS/SXRD or CRT. In RPTV, the display device, the projecting mechanism or CRTs, are hidden behind the screen inside the box. Due to the special screen material and the relatively smaller screen size, RPTVs are more suitable than front projectors for day time viewing.

I don't have an LCD set handy. My TV is rated at 240w (56" LED DLP RPTV). My friend's 42" plasma is 425w. Here's a Samsung 46" LCD that consumes 330w http://www.directtvs.co.uk/Samsung_4...NS/version.asp

One of the things people forget is that you still need to power the image processing engines inside. LED backlighting will take the power way down on LCDs however. Apparently they've gotten one of their new sets down to 90w

Last edited by WickyWoo; 03-27-2008 at 03:11 PM.
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Old 03-27-2008, 03:03 PM   #14
WickyWoo WickyWoo is offline
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Quote:
LCDs have a backlight and this consumes power in addition to switching low voltage LCD panel. However, I did not think that LCD would consume more power than projectors as the projectors also have an intense lamp (in addition to panels), in some cases the lamp could be high wattage. This is my feeling. I do not have any stats.
The size of the panels (very tiny) typically offsets the savings in power.

When you get these large LCD screens going, 40" and up it starts to really go up
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Old 03-28-2008, 08:36 AM   #15
syncguy syncguy is offline
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Quote:
Originally Posted by WickyWoo View Post
The size of the panels (very tiny) typically offsets the savings in power.

When you get these large LCD screens going, 40" and up it starts to really go up
Okay. This seems to be highly logical.
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Old 03-28-2008, 01:25 PM   #16
Husker Husker is offline
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Here are a couple of good websites that compare: http://reviews.cnet.com/4520-6475_7-6400401-3.html - and - http://www.energystar.gov/ia/partner...arch012006.pdf

Hope this helps.
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Old 03-31-2008, 02:16 PM   #17
syncguy syncguy is offline
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Another study on energy efficiency of different display types. Unfortunately dlps are not included.

According to this study, energy consumption from high to low:
plasma, front projectors, lcd and crt.

http://www.energyrating.gov.au/libra...harrington.pdf

When screen size is less than 100 cm lcds are better than projectors. This study has used 2004 material. Current technology could be somewhat different.
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Old 04-03-2008, 03:29 PM   #18
guitarist155 guitarist155 is offline
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ok it depends on size. under 19-20in from most to least is crt,plasma,lcd.

then over about 24in most to least it's plasma,lcd,crt, front projector, rptv
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Old 04-04-2008, 01:50 AM   #19
soccrstar soccrstar is offline
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my 37" LCD uses 203W
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