if I have 2 light which gives 60 lumens each… does the total of lumens is 120 ?

Yes.

ok so if i have 200 led ho make 62 lumens each ... it suposed to produce 12400 lumens ...

Are you sure that is not 6.2 lumens? Or maybe 62 lux?

i don't no if this link is a sure source but if it's allright the led then i chouse do 15,000 mcd with a 140 deg.

mcd to lumens LINK

and led then im going to use ( on ebay ) LINK


if you calculate it, it's done --Approximate luminous flux: 62.013 lumens-- for each led ...

so ... i guess ... 192 leds * 62.013 lumens done 11906,496 lumens ... right ?

and why 192 leds ? for a panel with the ratio 4*3 ( 16 leds * 12 leds).

so ... if i can add the light of mutiple leds ... i can do a great source for my projector with a minimal consomation.

11K lumens it is.

But keep in mind, that is total lumens. It is still 62 lumens per 5mm on the back of the LCD.
There are several threads about LED light engines in these forums. Should not be too hard to find them.

but i don't know if im going to take it ... i saw some threads about led ... and im not sure ... i want save money at long terms ( with low consomation ) but i don't know if the result of my panel can be compared with a lamp who make 11 k of lumens ... and if i take led ... i don't realy need fan to blow out heat. But one thing im sure ... fresnel and triplet lens ... im going to take it from lumenlab

62 lumens ... wow so thats like 1000lumens per watt efficiency
Those leds are WAY underpriced

how many lumens should i need to have a great image on screen ?
i read on an other thread then only 200 lumens pass trough lens and lcd from a light source of 3800 lumens ... it's possible ? ...

Yeah, Luxeon 5W LEDs are suppose to be 120 lumens, I actually believe that number. They were also about $25 EACH a couple years ago (I don't feel like getting the current price). There's no way you can buy 200 half as bright LEDs for $70...

I think I heard something about the light going into the LCD has to be within 7º. If you put 14º into the calculator you get .7 lumens, which might be closer.

yeah 0.7 up to 1.5 lumens per led is more reasonable, the cheapo leds are typically 10-20 lumens/watt efficient...

and yes lcd tranmissivity ~7%, triplet and fresnel ~75% so you need 20x what you want out going in

Could be interesting that you see the LEDs ultra bright of this page, the maximum mcd are 24000 for white LEDs (yours 15000), that is so much... (exist LEDS with more mcd, like 125000 or so).

http://www.led1.de/shop/index.php?cName=le...ltra-bright-c-3

The prize of the "ultra bright leds" are reduced dramatically in the last 5 years.

Note that the SMD leds (that is used in something post here, have a 720 mcd, and can't be compared with the before LEDs (720 vs 24000).

Greetings.

The Luxeon K2's, 130 lumens, 5.78W are down to about $5.50 per LED. Direct from Luxeon:
http://www.luxeonstar.com/item.php?id=1811...o=LXK2-PW14-U00

I am actually doing a hybrid project. I bought a used commercial DLP 1024x768 for $300 on ebay. I am going to combine this with homemade LED light source. I plan on getting about 25 of the Luxeon K2's and put them in a tightly packed circular array. If it works as planned I will get a 2x brighter picture for half the price and with a 10x greater lifespan than buying a replacement bulb.

If anyone is interested I will post the results when I am done,
Remy

you may not realize that less than 10 percent of the light actually makes its way through the LCD (or DLP) and the optics. Therefore you will need at least 100 of these LEDs and perhaps even more to achieve acceptable results. I doubt you could fit them into as tight of a space as you are wanting...

But companies are starting to use LED backlights in LCD TV's now. The results are supposedly far superior to traditional CFL backlighting. And here's the real kicker: you can individually turn off the LEDs to achieve much higher contrast ratios...

hmm... 3 degress spot lenses for Luxeon k2's, some one should definately build a small test rig with these one day... Any rich ppl out there with plenty of time??

http://www.luxeonstar.com/item.php?id=2214...rtno=OPK2-1-003

"hmm... 3 degress spot lenses for Luxeon k2's, some one should definately build a small test rig with these one day... Any rich ppl out there with plenty of time??"

Yep, I was planning on using these.

"You may not realize that less than 10 percent of the light actually makes its way through the LCD (or DLP) and the optics. Therefore you will need at least 100 of these LEDs and perhaps even more to achieve acceptable results. I doubt you could fit them into as tight of a space as you are wanting..."

Don't be such a nay-sayer. Alot of the loss that occurs in homebuilt LCD projectors is in the light going through the LCD. DLP doesn't have this problem, since it is essentially reflected light. My plan has always been to use the 3 degree spot lenses to harness as much of the light into a narrow beam as possible. Since I won't have the LCD eating the alot of the light I was hoping for only 50% loss. Which would still put me at 1625 lumens, a 63% brightness increase over the original bulb for this projector.

No one has really tried this before, so as far as I know any claims of a loss of 90% or 50% for that matter are pure speculation. Hell, I don't even know if anyone here has tried a DLP with one of the Lumen Lab bulbs or not, so how can anyone say that there is a 90% loss with DLP? The numbers for LCD are known and pretty well documented at this point, so I will give you the argument on that point. But come on people, how about a little possitivity and support. Let's not forget that this forum is here through the passion of experimentation and love of DIY, I know that's why I am here.

Remy

Just thought someone would be interested in these light panels. Extremely expensive. I wonder the lumen of these.

http://www.easycart.net/LitePanels/Litepanels_1x1.html

sounds like you've put some thought into it. DLP's are more light efficient. But their lamps still put out an order of magnitude more light than what actually makes its way to the screen. The 10% number may still be fairly accurate.

BTW - the DIY PJ typically outputs less than 1 percent of the available lamp lumen potential.

Sorry, not trying to sound like a naysayer - I didn't mean to come across that way. Actually I would like you to try this - LED's are the future and already showing up in new LCD TV's. But I wanted to give you some realistic perspective before you dive in.

I would suggest finding the total lumen output of the original lamp inside your DLP PJ. That should be available somewhere perhaps, if you spend enough time digging and searching. This will give you a realistic baseline. If your total LED lumen ouput is less, than you might not be gaining much...

someone suggested awhile back using a prism from a 3-chip commercial LCD projector to combine the light from three different sources.

This would seem an ideal way to install more LED's and combine their light into a single coherent "beam".

And conceivably you could use individual red, green, and blue LED's and the prism would combine them into "white" light.

Not sure though if you could go as far as replacing the DLP color wheel with electronic controls on the individual colored LED's....

Certainly the DLP projector makers are already considering these ideas...

links about new LED LCD TV's:

http://www.lumileds.com/solutions/solution.cfm?id=10

http://www.samsung.com/PressCenter/PressRe...0901_0000284318

unbelievable contrast ratios, because they can selectively turn off individual LED's.

Not sure if you can buy these in N.A. yet...

I followed your suggestion and found the wattage and lumens of the lamp itself. At 150W it runs 3000 lumens output at the lamp source in high power mode. Of which the projector outputs 1500 lumens in high power mode which is about 50% of the light from the source. It is estimated that about 20% of this loss is due to inefficiencies in the reflector and the non-reflective air gap between the lamp and the DLP chamber. So I think you are incorrect about the "typically outputs less than 1 percent of available lamp lumen" statment you made.

By your measurement (1 percent of the lumens are utilized) most commerical projectors would have to have an output of 100,000 lumens at the lamp. Since most projectors (>80%) use 150W - 250W lamps, this would mean they are achieving an average lumenous efficacy 400 - 667 lm/W. The high end of lumenous efficacy for latest production grade metal hallide, UHP, etc. bulbs is 150-200lm/W so I don't see how your numbers can even be close to "realistic".

That said, it will take alot more power than a conventional projector to run my LED version once it is built, because LED's only have a lumenous efficacy of 30 - 50lm/W (some of the research red LED's have 85lm/W). But I might be able to make up for it in the decreased consumption of power from the fans and electrical inefficiencies that happen with increased temperature inside the PJ. I would also think that the electronic components in an LED projector would last longer than one with a commercial lamp due to the decreased heat as well. Of course, that's just speculation.

Remy

Are you sure the 150W DLP lamp only outputs 3000 lumens at the source (lamp only)?

Because that's only 20 lm/W - which seems extremely low....

Actually what I said:

Do-It-Yourself (DIY) PJ's typically only output less than 1% of the available lamp's total lumens.

That number is an upper limit. Often it is less than 1/2 half of one percent. These values are based on many measurements of many different DIY PJ's over several years. They are pretty solid.

The 10% estimate was my best guess of the efficiency of a DLP projector.

What kind of 150W lamp did the DLP projector have inside? MH or UHP?

Using your numbers of 150 lm/W for a MH or UHP lamp, then your 150W DLP lamp should have a total output of about 22,500 lumens at the source.

So 10% of that is 2250 lumens, pretty typical for a (business) DLP projector.

That's why I said 3000 lumens seems pretty low for the lamp itself....

My projector is not current with the bulb technology, the bulbs for the projector I bought are circa 2001, thus the very poor 20lm/W rating. But yes, I am sure that my projector outputs 3k lumens at the bulb. Realistically it would be easier for me to just create a light assembly and use current bulb technology and get more lumens out. But I am a tinkerer and really want to try the LED approach. Besides, this is a spare DLP, I already have a working DLP that is better than this one, so there really is no loss in taking it appart and trying out the LEDs.

Remy