Riped off
😡 That is really not nice at all.What is this world comming to when this happens.It is out and out stealing.I hope you have a way of going after this person/s that did this to you.
😡 That is really not nice at all.What is this world comming to when this happens.It is out and out stealing.I hope you have a way of going after this person/s that did this to you.
Hello All
I have read for what seems like days, weeks and months, trying to get caught up to where everyone is at the present time. I would like to make an observation and ask a question at the same time.
It seems in the quest to get better picture quality for the OHP at first, and then in the Custom built projectors to follow, everyone is going to a larger screen. Larger screens provide better res and are cheaper I am assuming.
But with the larger screen you require much more light and with the light comes the heat problems and heat displacement measures i.e. glass, low e glass and the likes, which are not 100% effecient so you need even more light, which washes out the screen, and the resulting image is not bright enough so you go to a bigger lcd.
With the bigger screens you require more optics to make the larger LCD image evenly lit and small enough to fit on the projection lens.
and the cycle starts all over.
I have looked at the lcd projectors and they are not getting bigger as they are getting brighter and better.
Would it not be easier to start with a very high quality small LCD which would be able to handle a smaller more focuses back light sorce having less heat problems and less optics to blow the immage down then blow it back up again to view.
I am no scientist but I am learning, but it makes sence to me. In this case I am not sure bigger is better. We seam to be making bigger and bigger which needs brighter and brighter which creates hotter and hotter, which requires more low eglass and cold lenses which cuts down on the bigger light source you just put in.
Am I totaly off here or does it make sence?
Thank you for taking the time to read and respond.
PEBurton
I have read for what seems like days, weeks and months, trying to get caught up to where everyone is at the present time. I would like to make an observation and ask a question at the same time.
It seems in the quest to get better picture quality for the OHP at first, and then in the Custom built projectors to follow, everyone is going to a larger screen. Larger screens provide better res and are cheaper I am assuming.
But with the larger screen you require much more light and with the light comes the heat problems and heat displacement measures i.e. glass, low e glass and the likes, which are not 100% effecient so you need even more light, which washes out the screen, and the resulting image is not bright enough so you go to a bigger lcd.
With the bigger screens you require more optics to make the larger LCD image evenly lit and small enough to fit on the projection lens.
and the cycle starts all over.
I have looked at the lcd projectors and they are not getting bigger as they are getting brighter and better.
Would it not be easier to start with a very high quality small LCD which would be able to handle a smaller more focuses back light sorce having less heat problems and less optics to blow the immage down then blow it back up again to view.
I am no scientist but I am learning, but it makes sence to me. In this case I am not sure bigger is better. We seam to be making bigger and bigger which needs brighter and brighter which creates hotter and hotter, which requires more low eglass and cold lenses which cuts down on the bigger light source you just put in.
Am I totaly off here or does it make sence?
Thank you for taking the time to read and respond.
PEBurton
Example of 2 inch LCD
http://www.vfmstore.com/tv212.htm I wonder if this is good enough... I dont think so... What do you think.
http://www.vfmstore.com/tv212.htm I wonder if this is good enough... I dont think so... What do you think.
Re: Example of 2 inch LCD
I believe you are right...this LCD will be "unworthy". You have the right idea but there is a problem....as far as I know NO ONE has managed to find a "small" LCD that was worth buying for the money asked or the performance offered. What I mean to say is...."tiny perfect LCD's" are worth their weight in gold to the seller and "affordable small LCD's" are crappy low res toys.
Keep hunting and maybe you will save the day for us all.
zardoz
I believe you are right...this LCD will be "unworthy". You have the right idea but there is a problem....as far as I know NO ONE has managed to find a "small" LCD that was worth buying for the money asked or the performance offered. What I mean to say is...."tiny perfect LCD's" are worth their weight in gold to the seller and "affordable small LCD's" are crappy low res toys.
Keep hunting and maybe you will save the day for us all.
zardoz
PEBurton said:
Hey Guys
There is a sight on the net that have a good LED
assortment
126 clear white L.E.D s for about $270.00
Go check it it out.
L8r
Joe
http://members.shaw.ca/sagelighting/led_spotlights_and_bulbs_specifi.htm
There is a sight on the net that have a good LED
assortment
126 clear white L.E.D s for about $270.00
Go check it it out.
L8r
Joe
http://members.shaw.ca/sagelighting/led_spotlights_and_bulbs_specifi.htm
leds won't work
sorry to say that, but leds won't work. do you see the brightness of these things: white leds 5000-7500 mcd.
5000-7500 milli candela!!! ; candela = lumens
we are talking about 5 to 7,5 lumens !!!!!!!
in this forum we have problems with lamps which have 10000 to 35000 lumens because they are not bright enough to make a good picture.
And u are really think about 5 to 7,5 lumens. I would say forget about the led thing... there might be refelctors which make the leds 5 times brighter but even then, we are just talking about 35 lumens...
so may be they are good for a backlight of a tft but they will be never good enough for a projection, or if so they won't be payable...
sorry to say that, but leds won't work. do you see the brightness of these things: white leds 5000-7500 mcd.
5000-7500 milli candela!!! ; candela = lumenswe are talking about 5 to 7,5 lumens !!!!!!!
in this forum we have problems with lamps which have 10000 to 35000 lumens because they are not bright enough to make a good picture.
And u are really think about 5 to 7,5 lumens. I would say forget about the led thing... there might be refelctors which make the leds 5 times brighter but even then, we are just talking about 35 lumens...
so may be they are good for a backlight of a tft but they will be never good enough for a projection, or if so they won't be payable...
Don't rule out led's
I would tend to disagree with you about the led's. I am a member of diyprojection.com and we have been bouncing arround the idea of leds for a while (by the way if you havent seen that forum you need to it rocks and every is really helpful) but i was thinking about using an array of 120 to 140 10000mcd super bright white leds (these average about 12.3 to 20 lumens depending on quality) thanks that that fourm we have found a place that sells then in packs of 20 for $20.14 US, ill post the link later. so that meens that the output would range between 1,722 lumens and 2,800 lumens, if you were to use that in conjunction with BRF film from 3m that should be birght enough to watch in a dimly lit room
Xander
I would tend to disagree with you about the led's. I am a member of diyprojection.com and we have been bouncing arround the idea of leds for a while (by the way if you havent seen that forum you need to it rocks and every is really helpful) but i was thinking about using an array of 120 to 140 10000mcd super bright white leds (these average about 12.3 to 20 lumens depending on quality) thanks that that fourm we have found a place that sells then in packs of 20 for $20.14 US, ill post the link later. so that meens that the output would range between 1,722 lumens and 2,800 lumens, if you were to use that in conjunction with BRF film from 3m that should be birght enough to watch in a dimly lit room
Xander
The future is L.E.D lighting.
I have already seen trucks in my area using the LEDS for there
brake lights. They are also thinking of using them in our street lights. Ten year life span, no color shifting, very very low power
consumption. They will also be making car headlight with these things.
Then I grabed my $30.00 LED flashlight and put it behind my LCD
and behold, I laughed. Not much of a picture for a two LED
light, but sure enought it was there.
It may be worth it for someone to atleast try it.
L8r
I have already seen trucks in my area using the LEDS for there
brake lights. They are also thinking of using them in our street lights. Ten year life span, no color shifting, very very low power
consumption. They will also be making car headlight with these things.
Then I grabed my $30.00 LED flashlight and put it behind my LCD
and behold, I laughed. Not much of a picture for a two LED
light, but sure enought it was there.
It may be worth it for someone to atleast try it.
L8r
A Luxeon Star LED has about 660 candela. And if candela = lumens... then well, you know the rest.
daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! cd does not = lumens!!! I am going to make a section of my web site on how to convert the numbers. One 10,000 mcd led with a viewing angle of 15 degres is 2.1509 lumens. I lexeon emitter (if i remember from their website) can go as high as high as 150 lumens.
ooopsss 😱
yes u are right: here is the formula
so 10000mcd * 15angle --->>> 150000 m lumens
so 150 lumens is right...
but even then we are just talking about 150!!! lumens and is still a long way too 35000 lumens...
and the leds posted here had max 7500 mcd that would be 112,5...
yes u are right: here is the formula
so 10000mcd * 15angle --->>> 150000 m lumens
so 150 lumens is right...
but even then we are just talking about 150!!! lumens and is still a long way too 35000 lumens...
and the leds posted here had max 7500 mcd that would be 112,5...
Attachments
noodles said:
so the luxeon star led would have about 10000 lumens, but i think the viewing angle is the problem. u won't be able the light up the whole lcd.
there would start again with a small lcd with good resolution... 🙁
let me see what i got here...
What I ordered is a Luxeon Star/O LED, part number LXHL-ND94. I grabbed the datasheet from Luxeon's website, as well as a few other interesting documents. Let me give you the quick technical specs on this LED: Typical Candela on axis 660 Cd
Dominant wavelength 627 nm
Typical luminous flux 44 lumens <----- 😎
Junction material Aluminum Indium Gallium Phosphide
Typical forward voltage (Vf) 2.95 V
Forward test current (If) 350 mA
Max. forward current 385 mA
Cost US $15
the link: http://www.bit-tech.net/review/82/
What I ordered is a Luxeon Star/O LED, part number LXHL-ND94. I grabbed the datasheet from Luxeon's website, as well as a few other interesting documents. Let me give you the quick technical specs on this LED: Typical Candela on axis 660 Cd
Dominant wavelength 627 nm
Typical luminous flux 44 lumens <----- 😎
Junction material Aluminum Indium Gallium Phosphide
Typical forward voltage (Vf) 2.95 V
Forward test current (If) 350 mA
Max. forward current 385 mA
Cost US $15
the link: http://www.bit-tech.net/review/82/
^ Yeah that's where I saw it.
I went to the Luxeon website and it says their most powerful light output of the Luxeon family is the flood. It consists of 12 or 18 emitters. With an 18-emitter white Luxeon Flood... the typical luminous flux is 325lm. I bet the price of these things is pretty high too...
But the best part is that it's low-heat which means you don't need noisy overheadprojector fans. And they last around 10 years, so you don't need to buy replacement bulbs. I'm sure when 10 years comes around though, commercial LCD projectors will be extraordinarily cheap... but whatever. It's not an easy or cheap task... but it's nice overall.
I went to the Luxeon website and it says their most powerful light output of the Luxeon family is the flood. It consists of 12 or 18 emitters. With an 18-emitter white Luxeon Flood... the typical luminous flux is 325lm. I bet the price of these things is pretty high too...
But the best part is that it's low-heat which means you don't need noisy overheadprojector fans. And they last around 10 years, so you don't need to buy replacement bulbs. I'm sure when 10 years comes around though, commercial LCD projectors will be extraordinarily cheap... but whatever. It's not an easy or cheap task... but it's nice overall.
Actualy, luxeons are not low heat. You really need to have a heatsink when you run those things.
Ok... then I guess we can rule that one out then...
Is Metal Halide still the reigning king of projector lighting? What do they use in those commercial LCD projectors?
Is Metal Halide still the reigning king of projector lighting? What do they use in those commercial LCD projectors?
Well, that can be delt with, but at $40 for a 150 lumen 5 watt emmiter... thats a little pricey.
no leds are not bad after all, may be in 2 years they have one that we can use...
but for now i would say MH bulbs are best for diy projectors... the hours about 2000h - 8000h depends on the model is ok. only problem is you need at least 400W and better 1000W what i heard... i am still waiting for my 400W MH bulb, then i can say more... MH lamps are ok in price (about 50-100$)
in projectors they use NSI bulb for example. don't ask me whats that exactly. all i know it is very expensive (about 400$ one bulb). they last 2000h and have a lumen output of 100.000+ with 250W. some are in a vacuum. i guess these lamps are so expensive because of their special producing
but for now i would say MH bulbs are best for diy projectors... the hours about 2000h - 8000h depends on the model is ok. only problem is you need at least 400W and better 1000W what i heard... i am still waiting for my 400W MH bulb, then i can say more... MH lamps are ok in price (about 50-100$)
in projectors they use NSI bulb for example. don't ask me whats that exactly. all i know it is very expensive (about 400$ one bulb). they last 2000h and have a lumen output of 100.000+ with 250W. some are in a vacuum. i guess these lamps are so expensive because of their special producing
*** Hook Me Up!!!***
hi guys, i have a few questions and requests for you all. i want to install 50W Metal Halide bulbs into my cars headlights, so what i am looking for are two 50W MH bulbs and 2 ballasts that would power them. if anyone has any information on where i can get these items at a reasonable/cheap price, please let me know asap. my email: ikutuyev@sbcglobal.net thanks in advance
P.S. keep up the good work...
aleksey
hi guys, i have a few questions and requests for you all. i want to install 50W Metal Halide bulbs into my cars headlights, so what i am looking for are two 50W MH bulbs and 2 ballasts that would power them. if anyone has any information on where i can get these items at a reasonable/cheap price, please let me know asap. my email: ikutuyev@sbcglobal.net thanks in advance
P.S. keep up the good work...
aleksey