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Question about Bulbs for LCD Projection TVs

jack520
04-23-2006, 12:25 AM
Hi, I'm looking at LCD projection TVs now, but I'm reading how it requires changing bulbs, which cost around $200, and is the only reason that is stopping me from putting it on my list of possible TV choices.

A particular TV I'm interested in says the bulb lasts for 20000 hours, does this mean 20000 hours of it being used total or is it calculated some other way?

Generally, how often do you guys change the bulb? Every year? If so, is it really worth paying that much for such maintenance?

Also, how do you replace the bulb? Is it easy to do yourself or do you need to get a professional to do it?

PFC5
04-23-2006, 03:21 AM
Where did you read that the lamp will last 20000 hours? I have never heard of a lamp rated to last that long on ANY projection TV.

My RCA DLP HDTV has a philips lamp that is rated for 8000 hours in low power mode (all the brightness needed in this mode), and mine lasted 7800 hours before I had to replace the original lamp. From everything I have read, this is much longer than the "normal" lifespan of these lamps.

If you are talking about a front projector it is probably only 2,000 hours not 20,000 hours and could have been a typo. For RPTVs The highest rating I have seen is 8,000 hours. At least with DLP RPYVs, when you replace the lamp you get the original PQ back, but with LCD RPTVs there is a certain amount of LCD panel fade that slowly diminishes the PQ over time. TO be fair, the same thing happens with any CRT display either tube or RPTV too, but you do not notice it with the CRTs because I believe it is a slower process.

Hope this helps!

borromini
04-23-2006, 08:14 AM
...If you are talking about a front projector it is probably only 2,000 hours not 20,000 hours and could have been a typo. For RPTVs The highest rating I have seen is 8,000 hours. At least with DLP RPYVs, when you replace the lamp you get the original PQ back, but with LCD RPTVs there is a certain amount of LCD panel fade that slowly diminishes the PQ over time. TO be fair, the same thing happens with any CRT display either tube or RPTV too, but you do not notice it with the CRTs because I believe it is a slower process... Actually front projector lamps are now more like 3k to 4k hours and as for LCD RPTVs, panel degradation on the lastest models are practically a non-issue unless the TV experiences extended periods of overheating (fan failure).

The OP's quoted lamp rating is definitely not accurate.

BuTal63
04-23-2006, 09:02 AM
Hi, I'm looking at LCD projection TVs now, but I'm reading how it requires changing bulbs, which cost around $200, and is the only reason that is stopping me from putting it on my list of possible TV choices.

A particular TV I'm interested in says the bulb lasts for 20000 hours, does this mean 20000 hours of it being used total or is it calculated some other way?

Generally, how often do you guys change the bulb? Every year? If so, is it really worth paying that much for such maintenance?

Also, how do you replace the bulb? Is it easy to do yourself or do you need to get a professional to do it?

LCD FLAT PANEL tv's utilize a flourescent lamp to provide the screen's illumination. It is sometimes rated around 20,000 hours or in many instances much more. Most people would need professional service to have it replaced, but by then they may well be ready for a new set anyway.

If the set you are looking at is a REAR PROJECTION type lcd, then see the above answers. Lamp life for this tech. has been reported as long as 8,000 hours or so and as little as 1,000 hours or less, depending somewhat on the reliability of the sets' lamp circuitry and your luck. Some lamps themselves have been troublesome, too. The lamp housing is designed for relatively easy owner replacement of the lamp, usually with just a screwdriver or perhaps a special tool provided with the set. For most people, a service call is not required.

It would be helpful to know the specific set you are focusing on buying.

daleb
04-23-2006, 10:51 AM
Maybe he meant 2000 hours. After all, he is asking if we replace the bulb every year.

jack520
04-23-2006, 01:37 PM
Woops, sorry guys, I did mean 2000 not 20000. I was typing fast very late in the night.

The TV I am looking at is a rear-projection LCD, Panasonic PT-44LCX65

http://www2.panasonic.com/webapp/wcs/stores/servlet/vModelDetail?storeId=15001&catalogId=13401&itemId=93383&catGroupId=24976&modelNo=PT-44LCX65

The salesmen at the store told me that it lasts a little over 2000, while this morning I read a review that this model may last around 1500 - 2000. I am not too familiar with these types of TVs, and when I found that you need to spend a few hundred to replace bulbs I wasn't too happy.

But considering that it is possible to purchase this 44" for a few hundred more than 30" - 32" HD tubes, I am considering getting this. I also like the fact that it is much lighter. But I want to find out how often I need to replace these bulbs in case it becomes expensive to maintain.

Okay, so if it lasts for around 2000 does that mean simply total view time, or does it factor in how long it is on continuously?

Also, Is it possible to purchase different types of bulbs that last over 2000 so it won't need to be replaced as often (to reduce possibility of breaking something while replacing), or does every TV model have a unique type of bulb?

Thanks,

therock
04-23-2006, 01:37 PM
He may have read the HL-S5679W specs?

daleb
04-23-2006, 05:40 PM
Okay, so if it lasts for around 2000 does that mean simply total view time, or does it factor in how long it is on continuously?

Also, Is it possible to purchase different types of bulbs that last over 2000 so it won't need to be replaced as often (to reduce possibility of breaking something while replacing), or does every TV model have a unique type of bulb?

Thanks,

Be careful where you pick up lamps. Sometimes they are no cheaper at 3rd party retailers, even some cases where they are more. In any case, there only so many sources, and I believe brand names are usually the same.
And yes, different TV brands do not generally share the same bulbs, but one manfacturer may use the same bulb for more than one model.

Power cycling likely has some effect on bulb life. Some service menus record power cycles as well as lamp hours.

2000 hours is an approximation of 6 hrs/day, 365 days a year.

jack520
04-23-2006, 06:03 PM
Thank you for the reply.

The lamp for this particular TV is sold for $300 direct from Panasonic. I found the same lamp for around $270 elsewhere.

So it's going to cost $270 per year (more or less) to maintain the TV. If I use this TV for 5 years, it's going to cost me $1,350 for bulbs. :eek:

No wonder it was such a "good deal" for a 44" HDTV.

I believe I will go back to Direct View CRT/tube or LCD flat panel HD TVs.

borromini
04-24-2006, 12:08 AM
You'll be better off saving a little more money and going with flat panel technology...either LCD or plasma. I'd forget CRTs, they're smaller and heavier and the best ones are no longer made (Sony XBRs).

bobbyv
04-25-2006, 08:44 AM
HEY GUYS I HAD A TOSHIBA 48" REARPROJECTION THAT THE BULB/LAMP LASTED NO "SHIT" 12 YEARS 24-7 THAT TV WAS ON :bowdown: THE ONLY TIME IT WAS SHUT-OFF WAS WHEN THE POWER WENT OUT :mad: TO THIS DAY ITS STILL GOING STRONG MY SISTER OWNS IT NOW :} AND I WARNED HERE NOT TO SHUT IT OFF.. :eek: STILL CRYSTAL CLEAR WITH OVER 100K HOURS ON IT.. :yippee: AND COUNTING :bowdown:

daleb
04-25-2006, 09:47 AM
HEY GUYS I HAD A TOSHIBA 48" REARPROJECTION THAT THE BULB/LAMP LASTED NO "SHIT" 12 YEARS 24-7 THAT TV WAS ON :bowdown: THE ONLY TIME IT WAS SHUT-OFF WAS WHEN THE POWER WENT OUT :mad: TO THIS DAY ITS STILL GOING STRONG MY SISTER OWNS IT NOW :} AND I WARNED HERE NOT TO SHUT IT OFF.. :eek: STILL CRYSTAL CLEAR WITH OVER 100K HOURS ON IT.. :yippee: AND COUNTING :bowdown:

12 years ago they had rear projection displays that used a bulb?

borromini
04-25-2006, 04:54 PM
12 years ago they had rear projection displays that used a bulb?...and vacuum tubes. ;)

dpnaugle
04-29-2006, 03:07 PM
what is noted life of the rear projections bulbs for the Sony E55A20.

DN

borromini
04-29-2006, 03:09 PM
Don't know, check out the manual online at www.sony.com.

daleb
04-29-2006, 05:14 PM
what is noted life of the rear projections bulbs for the Sony E55A20.

DN

Same basic design of the KDF-WF and XS models of 2005. I would expect same average lamp life, 1 to 2 years, 2K to 4K hours.