View Full Version : why led?


ccheng187
03-09-07, 06:09 AM
I dont know much about this LED tech but with a little bit of reading in the forum, I want to know why people would want LED.
So, LED is just a better version than bulb , right?
With no rainbow, faster start time and all that but what if i dont see rainbow?.
I want to know this, with LED vs bulb, is it true that once the light engine goes out that mean you have to get a new tv because of the price to get it fix?
So why would you want a LED when you can change the bulb when it goes out?

davegow
03-09-07, 08:17 AM
...So why would you want a LED when you can change the bulb when it goes out?

At the present time that seems to be the facts. Samsung only claims 20,000 hours for their current technology. After that you have to replace the light engine which is $1500 or so, or almost half the cost of a new set. In the same time an owner of a conventional RPTV might have bought 3 regular lamps at $250 each. I don't think I'd be tempted unless the LEDs were rated at 60,000 hours or so, like some LCD backlamps are.

Some engineers claim that LED produces a better light for TVs (more complete spectrum) but I certainly wasn't impressed by the set I saw in a store.

LED lighting is not new but its application to RPTVs is. So we need to wait to see how things change in the future. This whole RPTV technology is improving dramatically, and it is reasonable to expect improvements. Panasonic has announced they are looking into the use of the same kind of high-intensity lamps used in high-end automotive headlights.

HFXguy
03-09-07, 08:17 AM
I know nothing about LED TV's but typically LED's would consume a lot less power plus have 20-25 year life.

Monty22001
03-09-07, 08:48 AM
No rainbow effect and the potential (2007's won't have this) to have 100,000 to 1 contrast ratio.

JohnDG
03-09-07, 09:09 AM
If it is going to be your family's prime TV, then the capability to turn the set off/on (cycling) when taking a break in viewing vs. avoiding short cycles with a bulb is a nice feature.

I get the impression the 20,000 hour rating is a conservative number.

jdg

serialmike
03-09-07, 09:12 AM
you guys do know that most all crt rear projection sets are rated at 15,000 hr life.
and that most tube sets life are rated at 25000 hrs

tv "life" rating means.....the time estimate given for the set to reach half the brightness it was when it was fiorst turned on......

It does not mewan the set will die around the exopecte dlife andyou need a new one.

It means the picture has degraded a certain amount. Many people would run projectio s 10 or more yrs! and tubes many more than that lol.

I myslef would consider these things jusnk by then but thats just me.

It is funny that people throw numbers and stats around and not know what they mean.

EBee
03-09-07, 10:08 AM
I know nothing about LED TV's but typically LED's would consume a lot less power plus have 20-25 year life.

These, plus the fantastic color on last year's Sammy LED are what are drawing me to this year's Sammy LED sets.

Obviously, since none are out yet, it's TBD on contrast and black improvements (last year's weaknesses, in my understanding).

davegow
03-09-07, 11:39 AM
...tv "life" rating means.....the time estimate given for the set to reach half the brightness it was when it was fiorst turned on......
It does not mewan the set will die around the exopecte dlife andyou need a new one....It is funny that people throw numbers and stats around and not know what they mean.

It is funny that some people take no pride in their spelling or punctuation and still expect their negative judgements of others to bear weight. However to your point there are a variety of failure modes among the various display technologies.

Conventional RPTV lamps do in fact fade towards the end but only moderately and briefly. Typically they then fail with a "pop" which is what mine did.

EBee
03-09-07, 04:17 PM
It is funny that some people take no pride in their spelling or punctuation and still expect their negative judgements of others to bear weight. However to your point there are a variety of failure modes among the various display technologies.

Conventional RPTV lamps do in fact fade towards the end but only moderately and briefly. Typically they then fail with a "pop" which is what mine did.

How about the rest of his points, spelling aside? I thought he brought some good points up, although I think that obviously a TV is a TV and the picture is what matters. The engine is just what gets us there (and each has positives and negatives).

Are we having a discussion here, or a face-off? I'm along for the ride either way.

Enter the THUNDERDOME!!!