If I recall correctly I believe one of the projector YHW used was the 3M 1720 (may have been his friend's). In any case, what makes that projector different is the lens used for the lighting source. What I'm wondering is what projectors that could be found in USA that would have that lens system and could be used for YHW design?
After some research, I have a tenative and vastly incomplete list:
Apollo AI-1000
Apollo AI-15000
3M 2100
3M 4400
3M 9550
3M 9800
Basically, it's most OHPs that use a EHJ, EVD, EYB, or FCS bulb, and maybe the ones that use a FNT. That is because they _should_ use a seperate reflector. However, it appears from the parts diagrams that not all of these OHPs also use a condenser lens, which seems to me to be a very important part of the equation. Again, however: just because the parts diagrams I have seen didn't list a condenser lens does not mean it's not there.
Unfortunately for those of us in the states, most of our OHPs use the ENX/FXL type bulb with the integrated reflector. But that just means the pickings are slim on ebay, not non-existant. I found 4 OHPs that were candidates for this mod in one day.
The good news out of all this mess is that some very inexpensive (~25$ on ebay) OHPs have the required innards for this mod.
The bad news is that, while the 250W MH HQI bulbs can be had for as low as $55, the cheapest HQI ballast for the 250W (M80) I have found is $125. Add in the $20 HQI lamp holder, and it'll cost you $200 to mod the OHP. If there were a cheaper way to make the ballast, I would dearly like to hear it.
Considering that a Dukane 622A or an Elmo A305SD can be had for about $200, it's a tossup: the 575W OHPs are brighter, but the homemade version uses cheaper bulbs.
I've been hunting around to see if I can mod the OHP using the 575W MH bulb, but I'm having trouble locating the lamp holder and ballast for it.
Apollo AI-1000
Apollo AI-15000
3M 2100
3M 4400
3M 9550
3M 9800
Basically, it's most OHPs that use a EHJ, EVD, EYB, or FCS bulb, and maybe the ones that use a FNT. That is because they _should_ use a seperate reflector. However, it appears from the parts diagrams that not all of these OHPs also use a condenser lens, which seems to me to be a very important part of the equation. Again, however: just because the parts diagrams I have seen didn't list a condenser lens does not mean it's not there.
Unfortunately for those of us in the states, most of our OHPs use the ENX/FXL type bulb with the integrated reflector. But that just means the pickings are slim on ebay, not non-existant. I found 4 OHPs that were candidates for this mod in one day.
The good news out of all this mess is that some very inexpensive (~25$ on ebay) OHPs have the required innards for this mod.
The bad news is that, while the 250W MH HQI bulbs can be had for as low as $55, the cheapest HQI ballast for the 250W (M80) I have found is $125. Add in the $20 HQI lamp holder, and it'll cost you $200 to mod the OHP. If there were a cheaper way to make the ballast, I would dearly like to hear it.
Considering that a Dukane 622A or an Elmo A305SD can be had for about $200, it's a tossup: the 575W OHPs are brighter, but the homemade version uses cheaper bulbs.
I've been hunting around to see if I can mod the OHP using the 575W MH bulb, but I'm having trouble locating the lamp holder and ballast for it.
Rolm said:
What site(s) is that? Also you said you have found four projectors. Do you mean you have found four projectors for sale or you have found four projectors that would work becasue i see you have listed 6 at the top.
I meant that I had found 4 OHPs on Ebay that were good candidates for this mod (that is, I was able to verify that they did indeed use the reflector/bulb/condenser setup).
As for the bulbs and the ballast, <a href="http://www.atlantalightbulbs.com/ecart/10Browse.asp?Category=MH-Double+Ended">Atlanta Light Bulbs</a> has about the best prices I was able to find.
That ballast I found at <a href="http://www.hellolights.com/25elbalmetha.html">HelloLights</a>. This was about the only place that I found it in the states. There was one or two other places, but they were over $200.
As for the bulbs and the ballast, <a href="http://www.atlantalightbulbs.com/ecart/10Browse.asp?Category=MH-Double+Ended">Atlanta Light Bulbs</a> has about the best prices I was able to find.
That ballast I found at <a href="http://www.hellolights.com/25elbalmetha.html">HelloLights</a>. This was about the only place that I found it in the states. There was one or two other places, but they were over $200.
rolm, have you looked at other bulb types such as single-ended T-15 metal halide bulbs? e.g. http://www.bulbs.com/products/product_detail.asp?page=products&inventory=8480
about the same price as an HQI bulb, but can be run on a conventional single-ended MH ballast. diameter is 1.875 in (4.7625 cm). i'm going to try to modify my EHJ OHP with the "reduced jacket" MH bulbs which are higher wattages (400w/1000w) in a form factor used by the smaller bulbs. (BT-28)
about the same price as an HQI bulb, but can be run on a conventional single-ended MH ballast. diameter is 1.875 in (4.7625 cm). i'm going to try to modify my EHJ OHP with the "reduced jacket" MH bulbs which are higher wattages (400w/1000w) in a form factor used by the smaller bulbs. (BT-28)
The problem is the size (1-7/8" diameter and 9-3/4" long). The real problem is the diameter, becuase the standard bi-pin bulb is only about 1/2" diameter. There must be enough room for air to flow around the bulb, or else you will get an awful lot of heat buildup that can damage your OHP or kill your bulb prematurely.
Also, this style bulb has a much larger arc than the HQI bulbs, which means that the point-source is larger, which might mess with the optics.
That being said, don't let my pessimism keep you from trying it. If you find that you can use these bulbs, they are much cheaper than an HQI setup.
There are single-ended bi-pin MH bulbs, but they are either maxxed out at 150W or $250+. There is also a 400W MH HQI bulb, but I was not able to find a ballast for that one at all.
Also, this style bulb has a much larger arc than the HQI bulbs, which means that the point-source is larger, which might mess with the optics.
That being said, don't let my pessimism keep you from trying it. If you find that you can use these bulbs, they are much cheaper than an HQI setup.
There are single-ended bi-pin MH bulbs, but they are either maxxed out at 150W or $250+. There is also a 400W MH HQI bulb, but I was not able to find a ballast for that one at all.
my name is YWH, not is YHW
575w dysprosium bulb, the bulb is a small dot.
6000k
3 lenses
my friend is using it every night ,to watch DVD , never refit
but ,not on net,not on ebuy.
this projector's price is about US$:200.LaserLine said:
An externally hosted image should be here but it was not working when we last tested it.
575w dysprosium bulb, the bulb is a small dot.
6000k
3 lenses
my friend is using it every night ,to watch DVD , never refit
An externally hosted image should be here but it was not working when we last tested it.
but ,not on net,not on ebuy.
http://members.cox.net/rolm/update/
<img src="http://members.cox.net/rolm/update/IMG_0513.JPG">
I should add that this was <b>ywh's</b> design, I just found different OHPs and implemented it.
<img src="http://members.cox.net/rolm/update/IMG_0513.JPG">
I should add that this was <b>ywh's</b> design, I just found different OHPs and implemented it.
Great Job Rolm! This is really going to help me for my projector and many other DIYer's out there. THANKS! BTW are those results projected on your wall? Also do you think you could get a picture of the projector in action. I know you said that 'I tried to take a picture to show this, but my camera is not up to the task.' but do you think maybe you could get a side shot if the light is having too much glare.
The image is projected on my DIY screen, which is a buytl-canvas dropcloth stretched over a frame.
The camera is really a piece of crap, but I will try to get a pic on Sunday (I'm going to be in Maine all weekend).
The camera is really a piece of crap, but I will try to get a pic on Sunday (I'm going to be in Maine all weekend).
So you finally retrofitted the ohp! Great job! How is the brighness as compared to the original halogen lamp, 2 times 3 times, ...? I am curious because as you know I have 150W MH single ended (10K lumens) and ellipsoidal set up so just wondering if its going to be enough light.
Also, is UV from ML lamp needs to be filtered? says on the lamp literature came with mine.
I have Eiki OHP with similar reflector and is a good candidate for small single ended or double ended retro ( I remembering we talked about it long time ago on our other thread even before ywh era!) Unfortunately I was not able to find small enough MH lamp at that time.
The biggest challenge I found in my set up is to figure out how to mount the lamp in elliptical reflector leaving enough air flow within the reflector and placing the arc at F1 in reflector. I need to come up with some sort of mount with 4 way adjusting mechanism to fine tune the position.. any suggestions?
I have not worked on my project since x'mas due to work related priorities.
Also, is UV from ML lamp needs to be filtered? says on the lamp literature came with mine.
I have Eiki OHP with similar reflector and is a good candidate for small single ended or double ended retro ( I remembering we talked about it long time ago on our other thread even before ywh era!) Unfortunately I was not able to find small enough MH lamp at that time.
The biggest challenge I found in my set up is to figure out how to mount the lamp in elliptical reflector leaving enough air flow within the reflector and placing the arc at F1 in reflector. I need to come up with some sort of mount with 4 way adjusting mechanism to fine tune the position.. any suggestions?
I have not worked on my project since x'mas due to work related priorities.
interesting....
i was looking at the inside of my ohp today a dukane 4003
there are 2 maps inside, an active one and one in standby.
these lamps are FXL 82 volts, 410 watts.
they are placed on the backside and through an angled mirror the light gets to the fresnel.
Now my idea.... if yuou have an Apollo or another ohp with a high body, can't you place a bulb like that (the socket is a very simple one, it should give you enough light righ? the bulb itself is only $12.50 for 50 hours but my first one, I used for about 110 hours . Not that expensive i think.
J-P
I supose that the fact that the bulb is only 82 volts makes it superbright, every bulb gets brighter when more current is guve right?
i was looking at the inside of my ohp today a dukane 4003
there are 2 maps inside, an active one and one in standby.
these lamps are FXL 82 volts, 410 watts.
they are placed on the backside and through an angled mirror the light gets to the fresnel.
Now my idea.... if yuou have an Apollo or another ohp with a high body, can't you place a bulb like that (the socket is a very simple one, it should give you enough light righ? the bulb itself is only $12.50 for 50 hours but my first one, I used for about 110 hours . Not that expensive i think.
J-P
I supose that the fact that the bulb is only 82 volts makes it superbright, every bulb gets brighter when more current is guve right?
rajkumar-
Yes, I finally have a working retrofit. I <b>also</b> have 6 seperate failed attempts at using other MH bulbs, including 4 handmade rectangular reflectors, 2 modified spherical reflectors (12" steel mixing bowls), and one handmade geodesic reflector (don't ask, it didn't even come close to working). Plus, that original 175 PAR bulb. I didn't blow that much money, but there was a LOT of time spent on this stuff.
Just eyeballing it, I'm probably getting somewhere between 2 and 3 times the brightness of the other 360W halogen OHP. It's bright enough that I am getting a somewhat washed-out image when there is a lot of black on the screen, because it comes out grey. This can probably be addressed by using alternate screen materials.
I think your single-ended 150W would probably work very well in this type of setup, and would probably be even easier to do than the 250W double-ended. I'm still kicking myself for not trying this kind of mod first (except I had no idea that there were different types of OHP out there), because it was so easy to do.
Furthermore, like I said on the webpage, given that the 250W HQI bulb is the same diameter as the single-ended medium-base 250 bulbs (which use a standard ballast rather than the expensive HQI ballast), this mod could be done for a whole lot less than I spent on it.
And yes, the HQI bulb requires UV sheilding. The fresnel and glass stage from the OHP provide enough filtering, but currently the light that comes out from the fan port is not filtered at all, and this should be addressed.
Lemme think about the 4-way adjustable mount, and I may be able to come up with something.
<b>uvodee-</b>
I'm having a little trouble understanding what you're asking. Are you asking if I could have just used an FXL bulb, rather than modding it to use a MH?
If this is what you're asking, the answer is: (a) it would have been even more work, and (b) it would have been about the same amount of light as before.
Yes, I finally have a working retrofit. I <b>also</b> have 6 seperate failed attempts at using other MH bulbs, including 4 handmade rectangular reflectors, 2 modified spherical reflectors (12" steel mixing bowls), and one handmade geodesic reflector (don't ask, it didn't even come close to working). Plus, that original 175 PAR bulb. I didn't blow that much money, but there was a LOT of time spent on this stuff.
Just eyeballing it, I'm probably getting somewhere between 2 and 3 times the brightness of the other 360W halogen OHP. It's bright enough that I am getting a somewhat washed-out image when there is a lot of black on the screen, because it comes out grey. This can probably be addressed by using alternate screen materials.
I think your single-ended 150W would probably work very well in this type of setup, and would probably be even easier to do than the 250W double-ended. I'm still kicking myself for not trying this kind of mod first (except I had no idea that there were different types of OHP out there), because it was so easy to do.
Furthermore, like I said on the webpage, given that the 250W HQI bulb is the same diameter as the single-ended medium-base 250 bulbs (which use a standard ballast rather than the expensive HQI ballast), this mod could be done for a whole lot less than I spent on it.
And yes, the HQI bulb requires UV sheilding. The fresnel and glass stage from the OHP provide enough filtering, but currently the light that comes out from the fan port is not filtered at all, and this should be addressed.
Lemme think about the 4-way adjustable mount, and I may be able to come up with something.
<b>uvodee-</b>
I'm having a little trouble understanding what you're asking. Are you asking if I could have just used an FXL bulb, rather than modding it to use a MH?
If this is what you're asking, the answer is: (a) it would have been even more work, and (b) it would have been about the same amount of light as before.
Thank rajkumar!
you said"ywh era",i am glad to hear that you said"ywh era",
but the reflector is not a elliptical reflector , it is sphericareflector ,it is very important.
Thank Rolm !
but i can not see this lens on your lamp
it is very important,if you need this lens ,you will get larger ratio of the light using
you said"ywh era",i am glad to hear that you said"ywh era",
but the reflector is not a elliptical reflector , it is sphericareflector ,it is very important.
Thank Rolm !
but i can not see this lens on your lamp
An externally hosted image should be here but it was not working when we last tested it.
it is very important,if you need this lens ,you will get larger ratio of the light using
don't woory about the temperature,the 250W HQI bulb is not hoter.a smaller fan is able to keep it cool
you need to make a block like this :http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg
buy a 13"~14" SONY LCD monitor,the 13"~14" SONY was used the hitachi LCD , the driverboard is not a block,you don't need to make the minicable to longer
you need to make a block like this :http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg
buy a 13"~14" SONY LCD monitor,the 13"~14" SONY was used the hitachi LCD , the driverboard is not a block,you don't need to make the minicable to longer
the right link
<img src=http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg alt=http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg>
<img src=http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg alt=http://photos.gznet.com/photos/1050416/1050416-CKMQFlhkjCjo1Bp$2sbv8iqBc9FKew.jpg>
<b>ywh-</b>
You are correct, my OHP did not come with the condenser lens, and I would need it to take advantage of more of the light from the bulb. I am looking into buying one and fitting it to the assembly.
You are correct, my OHP did not come with the condenser lens, and I would need it to take advantage of more of the light from the bulb. I am looking into buying one and fitting it to the assembly.
where'd everyone go....
please keep this thread alive. its become a vital source of retrofitting info for me and hopefully everyone else and i would like to see where this goes.
Jimmy
please keep this thread alive. its become a vital source of retrofitting info for me and hopefully everyone else and i would like to see where this goes.
Jimmy
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