Results
Yeah, we need results - everyone is saying what they're doing but not telling us how they got on! I'm particularly keen to find out how the white LEDs got on, and if my 5.6" LCD 960x234 screen will be ok.
I reckon I'm gonna just have a blast myself and then tell you all how I get on. Watch this space. I'll get photos too.
Yeah, we need results - everyone is saying what they're doing but not telling us how they got on! I'm particularly keen to find out how the white LEDs got on, and if my 5.6" LCD 960x234 screen will be ok.
I reckon I'm gonna just have a blast myself and then tell you all how I get on. Watch this space. I'll get photos too.
What do you want to know? This post is extremely long. It's understood why you think no progress has been made, but you see, there was NOTHING before this. Lots of people, I have read, say they have completed projector projects, but no one shows. Others make you pay for their plans.
There are experimental aspects to this project:
First, none of use have ever made one before.
Second, I was searching for alternate light sources to keep this thing from needing fans, and possibly lasting longer than 2000 hours, which I have not completely given up on yet.
Lastly, no one here whom has started working has promised anything. Further more, anyone who HAS completed part of the project, HAS presented what they have found.
Dwalls32 for example, but since dropped off.
I don't have a digital camera, so I can't take pictures and post them. In any case, and I have said this before, I won't post pictures until I have something working. Besides, I don't work on this project everyday. I don't know about everyone else.
Vince
There are experimental aspects to this project:
First, none of use have ever made one before.
Second, I was searching for alternate light sources to keep this thing from needing fans, and possibly lasting longer than 2000 hours, which I have not completely given up on yet.
Lastly, no one here whom has started working has promised anything. Further more, anyone who HAS completed part of the project, HAS presented what they have found.
Dwalls32 for example, but since dropped off.
I don't have a digital camera, so I can't take pictures and post them. In any case, and I have said this before, I won't post pictures until I have something working. Besides, I don't work on this project everyday. I don't know about everyone else.
Vince
The projector project
I'm new here, but don't blow me off for that.
I have been following this thread for a while now.
And this project is not dead, or stagnet as suggested
by Type-E in fact, it and others like it are doing fine.
There are other forums out there that are a littl ahead
of this one , for instance http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=006hui
Here is a quote from Chance, he is the one that set up the above mentioned forum......"This project is so worth waiting for, when you finally are able to watch your projector it will give you GOOSE BUMPS!!!"
Does this sound like it is a dead project or not going anywhere. I am not suggesting this forum or the other, it is good that we have more than one, but it is not a choice we have to make.
I am reading both of them and gathering the information to make informed decisions about which way I am going to go with my project. Please don't complain that there are no results posted or pictures shown.
This is not something that is drawn out in black and white. This is experimentation, trial and error, if this don't work we'll try another way.
But I strongly think we can all get this working, the only question will be, at what cost in time and dollars. I don't think the labor is an issue here. We do it for the fun of it. The two remaining issues for this project I think are the light source and the cooling(fan noise) I think it has been proven that with sufficient light (above 4000 lumens for daytime viewing) it will work.
Well I have gone on long enough.
Thanks for all the interestin post, I will contribute all
I can, as I begin my project.
Thanks
I'm new here, but don't blow me off for that.
I have been following this thread for a while now.
And this project is not dead, or stagnet as suggested
by Type-E in fact, it and others like it are doing fine.
There are other forums out there that are a littl ahead
of this one , for instance http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=006hui
Here is a quote from Chance, he is the one that set up the above mentioned forum......"This project is so worth waiting for, when you finally are able to watch your projector it will give you GOOSE BUMPS!!!"
Does this sound like it is a dead project or not going anywhere. I am not suggesting this forum or the other, it is good that we have more than one, but it is not a choice we have to make.
I am reading both of them and gathering the information to make informed decisions about which way I am going to go with my project. Please don't complain that there are no results posted or pictures shown.
This is not something that is drawn out in black and white. This is experimentation, trial and error, if this don't work we'll try another way.
But I strongly think we can all get this working, the only question will be, at what cost in time and dollars. I don't think the labor is an issue here. We do it for the fun of it. The two remaining issues for this project I think are the light source and the cooling(fan noise) I think it has been proven that with sufficient light (above 4000 lumens for daytime viewing) it will work.
Well I have gone on long enough.
Thanks for all the interestin post, I will contribute all
I can, as I begin my project.
Thanks
Well, don't I feel bad. I never said this project was dead - I think it's fantastic. And vdi_nenna deserves credit for starting it all off.
It's good we have ideas to share, and as soon as I start building I will be sharing plenty I'm sure. All I meant was that I agreed with Type-E in that it seems like some people are drifting off. Now it's obvious that they're probably just stuck, not dis-interested.
I think this is a great forum - it and others like it are going to prove very rewarding in the future.
Will be back with developments as they take place. I reckon I'm gonna go with a cheap halogen initially, just to get an idea of screen quality/size, etc. then go with LEDs once they've been proven by someone who's already bought them. i'm sure they must be bright enough.
Cheers,
It's good we have ideas to share, and as soon as I start building I will be sharing plenty I'm sure. All I meant was that I agreed with Type-E in that it seems like some people are drifting off. Now it's obvious that they're probably just stuck, not dis-interested.
I think this is a great forum - it and others like it are going to prove very rewarding in the future.
Will be back with developments as they take place. I reckon I'm gonna go with a cheap halogen initially, just to get an idea of screen quality/size, etc. then go with LEDs once they've been proven by someone who's already bought them. i'm sure they must be bright enough.
Cheers,
The LED as a light source
The LED as a light source.. This I do think is fruitless.
If the Projector is going to be used in an Movie theater type enviroment where it is absolutly dark it may get by as watchable.
But my intentions are to be able to use it in a fairly well lighted room. I have found that OHP's are rated in lumens
and that a well lighted room or conference room will require
3000 to 4000 lumens. This of course is not the only variable, we must also consider the contrast of the LCD panel, which at this point is a given for me. I have already purchased a projector panel. I have not however porchased an OHP this is the part that is going to be difficult. We need an light source of 3000 lumens or better we need to do this at a reasonable cost (long lasting expensive bulbs or short lived inexpensive bulbs we must also be ableto disipate the heat(if any) generated by the light souce.
thanks
The LED as a light source.. This I do think is fruitless.
If the Projector is going to be used in an Movie theater type enviroment where it is absolutly dark it may get by as watchable.
But my intentions are to be able to use it in a fairly well lighted room. I have found that OHP's are rated in lumens
and that a well lighted room or conference room will require
3000 to 4000 lumens. This of course is not the only variable, we must also consider the contrast of the LCD panel, which at this point is a given for me. I have already purchased a projector panel. I have not however porchased an OHP this is the part that is going to be difficult. We need an light source of 3000 lumens or better we need to do this at a reasonable cost (long lasting expensive bulbs or short lived inexpensive bulbs we must also be ableto disipate the heat(if any) generated by the light souce.
thanks
There some research into the development of LEDs that emit circular polarised light for display devices, when used with the complimentary circular polarised LCD panels almost eliminates the light loss that seems to be a major problem with current linearly polarised systems.
The LED Projector may have to wait a few years?
<hr width="95%" align=center>
I was recently given a broken OHP projection panel, Infocus 5000cx, I didn't realise that they had a Fresnel each side of the LCD, when on an OHP that adds up to three Fresnels. Don't know if that will be news to anyone else but was to me.
Regards
James
The LED Projector may have to wait a few years?
<hr width="95%" align=center>
I was recently given a broken OHP projection panel, Infocus 5000cx, I didn't realise that they had a Fresnel each side of the LCD, when on an OHP that adds up to three Fresnels. Don't know if that will be news to anyone else but was to me.
Regards
James
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1302073459
I think this is a good pic of what we get, not bad. I wonder how big is the projected image, I hope it's somewhere around 100"
Does anyone know how long does Overhead project bulb lasts?
I think this is a good pic of what we get, not bad. I wonder how big is the projected image, I hope it's somewhere around 100"
Does anyone know how long does Overhead project bulb lasts?
led information
hi all,
this is some useful information about white led:
http://www.pioneernet.net/optoeng/LED_FAQ.html#LINKS
http://www.misty.com/people/don/ledx.html
http://www.misty.com/people/don/ledrgb2w.html
Excerpt from: http://www.cens.com/linerpt/20000524066.html
It was predicted that LED lights would be able to generate 10 lumens of light per watt by 2000 and more than 100 lumens per watt by 2005, and that they would have a lifespan of 100,000 hours.
Today, the cost per lumen has dropped to US$0.06, and a 20- or 30-lumen LED that makes up the stop lamp costs only around US$1.5.
If 1 led=1 lumen, to make bright enough for our projector (ideal is 10000 lumens) we need 10000 leds!
http://www.eio.com/public/led/0242.html
some led data / chart:
http://www.ledtronics.com/Utilizing_LEDs/led_color_chart/38.htm
http://www.ledtronics.com/Utilizing_LEDs/LED_Wattage.htm
a single white LED with output of seventeen lumens.
Better! so we need 10000/17=588 leds.
http://www.lightboard.net/newspub/story.cfm?ID=70
see you.
hi all,
this is some useful information about white led:
http://www.pioneernet.net/optoeng/LED_FAQ.html#LINKS
http://www.misty.com/people/don/ledx.html
http://www.misty.com/people/don/ledrgb2w.html
Excerpt from: http://www.cens.com/linerpt/20000524066.html
It was predicted that LED lights would be able to generate 10 lumens of light per watt by 2000 and more than 100 lumens per watt by 2005, and that they would have a lifespan of 100,000 hours.
Today, the cost per lumen has dropped to US$0.06, and a 20- or 30-lumen LED that makes up the stop lamp costs only around US$1.5.
If 1 led=1 lumen, to make bright enough for our projector (ideal is 10000 lumens) we need 10000 leds!
http://www.eio.com/public/led/0242.html
some led data / chart:
http://www.ledtronics.com/Utilizing_LEDs/led_color_chart/38.htm
http://www.ledtronics.com/Utilizing_LEDs/LED_Wattage.htm
a single white LED with output of seventeen lumens.
Better! so we need 10000/17=588 leds.
http://www.lightboard.net/newspub/story.cfm?ID=70
see you.
I have LED with 5.6 lumens each. Not all are created equal either. some have blue rings when shined on a white surface, like what you get a radio shack. Not good.
The ones I have are bright as hell. 48 light up a whole room.
That's why I can't understand why I can't get them to be as bright through the lenses. It might be a single point of origin issue.
The ones I have are bright as hell. 48 light up a whole room.
That's why I can't understand why I can't get them to be as bright through the lenses. It might be a single point of origin issue.
Further browse around and I found this:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1674580027
The "Apex no disc" projection is 60' diagonally but it's so dark even from his 6000lumens projector. the 150' picture projected to his ceiling looks like crap to me.
vdi_nenna: how did you hook up your LEDs? what power supply did you use?
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1674580027
The "Apex no disc" projection is 60' diagonally but it's so dark even from his 6000lumens projector. the 150' picture projected to his ceiling looks like crap to me.
vdi_nenna: how did you hook up your LEDs? what power supply did you use?
I wired them by hand, 3 in series w/ a resistor for 3 volts @ 320 mA? I don't remember the amps. It was just under the current limit, so they last longer. I used a 12v 1 amp power supply. 48 all together to form a block.
They are Nichin LEDs. The best so far. I got them for $1.50 each.
[Edited by vdi_nenna on 12-12-2001 at 12:43 PM]
They are Nichin LEDs. The best so far. I got them for $1.50 each.
[Edited by vdi_nenna on 12-12-2001 at 12:43 PM]
more about led
hi,
more information about led:
from Luxeon:
http://www.luxeon.com/products/flood_index.html
download data sheet (pdf file)
they explain how to connect 12-18 leds, included circuit diagram.
from the given data, I try to compile:
1 unit consisting: 12 leds, produce 215 lumens at 21 volt, 700 mA total.
= 21x0.7=14.7 Watts, power consumption / unit.
So if we need 10000 lumens, it's become:
10000/215=46.5 ~ 47 unit leds, consisting 47x12=564 individual led!
Power consumption is 47x14.7=690.9 Watts total.
Am I correct?
hi,
more information about led:
from Luxeon:
http://www.luxeon.com/products/flood_index.html
download data sheet (pdf file)
they explain how to connect 12-18 leds, included circuit diagram.
from the given data, I try to compile:
1 unit consisting: 12 leds, produce 215 lumens at 21 volt, 700 mA total.
= 21x0.7=14.7 Watts, power consumption / unit.
So if we need 10000 lumens, it's become:
10000/215=46.5 ~ 47 unit leds, consisting 47x12=564 individual led!
Power consumption is 47x14.7=690.9 Watts total.
Am I correct?
leds ???
yes, it's costly! as I wrote on previous post.
more lumens you want, more money you'll spend.
luxeon star (23 lumens) cost $14 each!
http://ledmuseum.home.att.net/agilent.htm
10000 lumens need 435 leds times $14, worth $6090 !
yes, it's costly! as I wrote on previous post.
more lumens you want, more money you'll spend.
luxeon star (23 lumens) cost $14 each!
http://ledmuseum.home.att.net/agilent.htm
10000 lumens need 435 leds times $14, worth $6090 !
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