Ok the claims from led makers blabbing about length of bulb life is officially BULL$h|T!!! Epson unit only 6 months old blew out at 1103 hours and the hitachi at 1178 at 8 months old. Called both companies and both said the 10,000 hour claim is only when the projector is on lowest brightness settings and has a smaller concentrated image with lower contrast. WTF!!??? And since these bulbs last 10,000 hours, these companies feel their value is higher so they feel the need to charge 790 bucks for replacement. So yeah......bull****!!
Joined: 08 Mar 2006 Posts: 18065 Location: Langley, BC
Link Posted: Tue May 01, 2012 12:59 pm Post subject:
Sorry, I can't help but laugh when I read those hour claims. We've talked about the CFL bulbs dying. I buy mine at Costco, and while I haven't had one go out yet, I sure as shite am hanging onto the receipts to storm back to get replacements if they die under the claimed 7 year lifespan. I do believe Case though, it most likely isn't the LED 'bulb' (how DARE you!), it's the caps around them. Won't the LED TV people be in for a rude shock in a year or two...
Link Posted: Tue May 01, 2012 2:21 pm Post subject:
CasetheCorvetteman wrote:
It wont be the LEDs, it is usually the circuitry driving it.
Ive repaired a few MR-16 SELV LED bulbs by replacing leaking capacitors in them, made too cheap.
I've tried and tried and tried to tell people this. The LED's might be good for 20k, but your 499 dollar vivatek will probably blow a board or power supply WELL before then. They just don't understand.
Joined: 08 Apr 2006 Posts: 7097 Location: Fort Collins, CO
Link Posted: Tue May 01, 2012 4:43 pm Post subject:
That would deffo suck if these LED sets blew up after a year or two. They "SHOULD" last "forever," but of course that would reduce the manufacturers' revenue when people didn't replace them every 2-3 years...
My brother bought a Samsung LED rear-pro TV about 3 yrs ago. He doesn't watch it a LOT but it's still going strong. He will be majorly pissed if it blows up just about the time he retires next year...
Link Posted: Tue May 01, 2012 4:58 pm Post subject:
Try being in IT!!!....I love going to management with crap like this and telling them the customers claims suck. After all we make the polarizers for many projector companies. You'd think they would know this info. Sucks because it makes our products look bad because we are associated with those companies. However as an FYI the Epson bulb issue was the bulb itself actually blowing out.....I guess a cap could have wrecked it but.....yeah..!!
Link Posted: Wed May 02, 2012 9:10 am Post subject:
I guess I am missing something. We are talking about LED, but then the word bulb keeps coming into play. Does not compute. _________________ Trust no one. Absolutely no one. Advice of the board.
Joined: 09 Nov 2008 Posts: 1968 Location: QLD, Australia
Link Posted: Thu May 03, 2012 2:16 pm Post subject:
WanMan wrote:
I guess I am missing something. We are talking about LED, but then the word bulb keeps coming into play. Does not compute.
So if we spoke about horticulture, and the word bulb came up, would that compute any better??
TheVerge wrote:
CasetheCorvetteman wrote:
It wont be the LEDs, it is usually the circuitry driving it.
Ive repaired a few MR-16 SELV LED bulbs by replacing leaking capacitors in them, made too cheap.
I've tried and tried and tried to tell people this. The LED's might be good for 20k, but your 499 dollar vivatek will probably blow a board or power supply WELL before then. They just don't understand.
Yeah mate youre going to struggle trying to explain facts like these to anyone that doesnt understand how it works.
Curt Palme wrote:
Sorry, I can't help but laugh when I read those hour claims. We've talked about the CFL bulbs dying. I buy mine at Costco, and while I haven't had one go out yet, I sure as shite am hanging onto the receipts to storm back to get replacements if they die under the claimed 7 year lifespan. I do believe Case though, it most likely isn't the LED 'bulb' (how DARE you!), it's the caps around them. Won't the LED TV people be in for a rude shock in a year or two...
Curt i reckon the LED would be good for alot more than 20,000 hours, if indeed the circuit feeding them is built to a good spec, they should theoretically last almost indefinately.
CFLs are the biggest joke going these days, i look back at the older big fat fluro tubes that are still going strong and bright after 30 years of regular daily use, ends covered in corrosion from the salt air, yet working without a glitch, day in, day out. Its not just the tube that is responsible for this, its the starter and iron core ballast, but they are all a complete package ( most electronic ballasts seem to kill tubes by driving all the mercury down to one end of the tube, youll know this has happened when one end has an inch of black and the other is near new looking ). No added mercury sounds great to the average consumer, sounds nice and green, cause none of them understand that no added mercury doesnt mean there is none in there, just means they didnt add any more than they needed to make it light up for a few months. I dont know how many youve noticed that after 6 months are quite dim compared with new ones, or even turn pink instead of white, being an electrician i see loads like this, and i can only put the reduced life down to the RoHS they CLAIM to have... I say claim cause look how long the non RoHS ones lasted, 30 f***en years plus, compared with 12 months if youre VERY lucky.. Where do people think these dead fluros go when they dispose of them???? What is the best option?? Throw out 50 RoHS compliant fluros in 30 years or use the same one til long after youre too old to get up there and change it yourself??
I have a stash of NEC ( and you know my love for NEC quality goes beyond CRT projectors!! ) made in Japan fluro tubes at work im keeping aside, so in a few years i can pull one out and say "this is what we used to use... and they even lasted longer than the average marriage too...."
Joined: 08 Mar 2006 Posts: 18065 Location: Langley, BC
Link Posted: Thu May 03, 2012 2:30 pm Post subject:
IN theory, you're right. In reality, you can bet that they are all made in China, and I guarantee that they won't last.
I think I posted in another thread how light bulb life is calculated, right? (this from the owner of an LED lighting company that has had many an issue with suppliers from China):
They used to screw 100 light bulbs into a large panel and let them run 24/7. ONce half would burn out, that would be the rated life of the bulbs. Seems archaic, but since they can't do that with LEDs, I'll bet the lifespan is only calculated on paper.
Link Posted: Fri May 04, 2012 2:20 am Post subject:
I've tried several brands of bulbs for home use and have had varying degrees of results,but I learned a few things
they don't advertise on the package after calling manufacturers.
1-Led bulbs continually lose brightness throughout their life,much like the other types.
The rate at which they lose brightness depends on type of led,how hard driven,how long use in each sitting.
One brand I got the engineer admitted that though the rated life was about 20-30k hours the light level would be
up to 60% loss from new bulb.The initial few weeks might see up to double digit rolloff then a slow even loss the
rest of the life.
2-In that brand the life expectancy was based on a 2-4 per day use.Unlike fluorescent that gets maximum life with
non-stop use,led's lose life with continual use.
Look at the signal lamps that energy conservation proponents bragged changing to LED's would not only save
energy but maintenance costs.I see premature failures everywhere.
Consider that a standard 1034/1157 or even the new standard model costs less than $2 each and that's overpriced,
a very common truck lamp used widely in the industry stopped using those in favor of a led module inside.
The replacement assembly costs over $50,any wonder why manufacturers are GaGa in changing over to led!
So far I've seen 2 methods of driving leds,the less common is simply dividing voltage equally over a given number
of bulbs,however the old christmas tree(1 out all fail) tends to happen,but find the offending bulb and you might
be able to fix.
The second and most popular and prone to fail is driving sets of lamps from sub circuits and then feeding all the
subs from a common supply.I've found that it is the subs or the power supply that fail most of the time and not the
individual bulbs,but few are going to spend the time analyzing home lamps.
I'm sure the TV sets are not too far off from the design of lamp lights.
Keep area as cool as possible, don't run tv endless hours.
I don't have LED tvs,but maybe they offer reduced backlight settings(driving bulbs less) or even like Windows that shuts
monitor with use time limits when inactive.
"The candle that burns twice as bright, burns half as long, and you burned very, very brightly Roy." _________________ Macht Nichts!
Link Posted: Fri May 04, 2012 3:53 am Post subject:
2manytvs wrote:
I've tried several brands of bulbs for home use and have had varying degrees of results,but I learned a few things
they don't advertise on the package after calling manufacturers.
1-Led bulbs continually lose brightness throughout their life,much like the other types.
The rate at which they lose brightness depends on type of led,how hard driven,how long use in each sitting.
One brand I got the engineer admitted that though the rated life was about 20-30k hours the light level would be
up to 60% loss from new bulb.The initial few weeks might see up to double digit rolloff then a slow even loss the
rest of the life.
2-In that brand the life expectancy was based on a 2-4 per day use.Unlike fluorescent that gets maximum life with
non-stop use,led's lose life with continual use.
Look at the signal lamps that energy conservation proponents bragged changing to LED's would not only save
energy but maintenance costs.I see premature failures everywhere.
Consider that a standard 1034/1157 or even the new standard model costs less than $2 each and that's overpriced,
a very common truck lamp used widely in the industry stopped using those in favor of a led module inside.
The replacement assembly costs over $50,any wonder why manufacturers are GaGa in changing over to led!
So far I've seen 2 methods of driving leds,the less common is simply dividing voltage equally over a given number
of bulbs,however the old christmas tree(1 out all fail) tends to happen,but find the offending bulb and you might
be able to fix.
The second and most popular and prone to fail is driving sets of lamps from sub circuits and then feeding all the
subs from a common supply.I've found that it is the subs or the power supply that fail most of the time and not the
individual bulbs,but few are going to spend the time analyzing home lamps.
I'm sure the TV sets are not too far off from the design of lamp lights.
Keep area as cool as possible, don't run tv endless hours.
I don't have LED tvs,but maybe they offer reduced backlight settings(driving bulbs less) or even like Windows that shuts
monitor with use time limits when inactive.
"The candle that burns twice as bright, burns half as long, and you burned very, very brightly Roy."
This is why I choose a plasma as opposed to LED plus they work fine at 7000 ft now. Time will tell.....
Joined: 09 Nov 2008 Posts: 1968 Location: QLD, Australia
Link Posted: Fri May 04, 2012 1:23 pm Post subject:
Curt Palme wrote:
IN theory, you're right. In reality, you can bet that they are all made in China, and I guarantee that they won't last.
Not these NECs, made in the 90s, i inherited this stash They sure last alright, ive used a couple of them around work, and ive never pulled one back out yet, which is why i deemed them way too good to use in this day and age!!
Link Posted: Mon May 07, 2012 4:27 pm Post subject:
2manytvs commented:
> I'm sure the TV sets are not too far off from the design of lamp lights. <
Why are you sure about that?
I suppose it depends on what type of TVs you're talking about... LED backlit, or RPTV (with a single LED element per primary). You may be right about the former, but wrong about the later. _________________ - Tim
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Link
), it's the caps around them. Won't the LED TV people be in for a rude shock in a year or two...
They sure last alright, ive used a couple of them around work, and ive never pulled one back out yet, which is why i deemed them way too good to use in this day and age!! 
