i found an old lamp in my storage room
i need someone to recognize what kind is it
and if i can use it for a projector
ill use a 5" psone lcd
probably with a crt lens as ancorp ( god 🙂 )suggested here :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=48163
here are the pics :
the lamp -
base -
together -
warming up -
done -
i almost didnt see it cuz its old and very dim but it says
maf 125w
i googled it and came up with
http://www.lamptech.co.uk/Documents/M14B Sulphide.htm
looks like its mecury flourescent
will it be sufficient? or should i go for a metal halide one?
thx in advance 🙂
i need someone to recognize what kind is it
and if i can use it for a projector
ill use a 5" psone lcd
probably with a crt lens as ancorp ( god 🙂 )suggested here :
http://www.diyaudio.com/forums/showthread.php?s=&threadid=48163
here are the pics :
the lamp -
An externally hosted image should be here but it was not working when we last tested it.
base -
An externally hosted image should be here but it was not working when we last tested it.
together -
An externally hosted image should be here but it was not working when we last tested it.
warming up -
An externally hosted image should be here but it was not working when we last tested it.
done -
An externally hosted image should be here but it was not working when we last tested it.
i almost didnt see it cuz its old and very dim but it says
maf 125w
i googled it and came up with
http://www.lamptech.co.uk/Documents/M14B Sulphide.htm
looks like its mecury flourescent
will it be sufficient? or should i go for a metal halide one?
thx in advance 🙂
old lamp
If it is dim, then it won't work for your projector. You need a lamp so bright it hurts your eyes to look at it. MH is by far the best, and you need a non-frosted bulb, too. The only problem with MH is that the very cheapest bulb & ballast combo costs at least $60.
Halogen bulbs are much cheaper (ie. $7) and don't use a ballast. Their problem is excessive heat, so you need to have glass or a real IR filter, and fans.
Some people claim to have good results with Fluorox lights, and posted pretty good images. Not as good as MH.
If it is dim, then it won't work for your projector. You need a lamp so bright it hurts your eyes to look at it. MH is by far the best, and you need a non-frosted bulb, too. The only problem with MH is that the very cheapest bulb & ballast combo costs at least $60.
Halogen bulbs are much cheaper (ie. $7) and don't use a ballast. Their problem is excessive heat, so you need to have glass or a real IR filter, and fans.
Some people claim to have good results with Fluorox lights, and posted pretty good images. Not as good as MH.
Hmm for me halogens cost 3.99 canadian for 2 500watt bulbs... they are double ended though.
What I hate about halogens is not only the heat
, but also the inefficiency of electicity (500watts, and only about 8500-9500 lumens...)
Too bad I cant afford (or find in a store for that matter) an MH setup...🙁
Eh, life sucks, lol🙂
What I hate about halogens is not only the heat
, but also the inefficiency of electicity (500watts, and only about 8500-9500 lumens...)Too bad I cant afford (or find in a store for that matter) an MH setup...🙁
Eh, life sucks, lol🙂
Re: old lamp
its not dim the writtting on it is dim 🙂
ill try to get a mh one
what is the lifespan of an mh bulb?
thx 🙂
and ancore - save up some money and ull be able to buy one 🙂
otherwise yeh life sucks hehe
Guy Grotke said:
its not dim the writtting on it is dim 🙂
ill try to get a mh one
what is the lifespan of an mh bulb?
thx 🙂
and ancore - save up some money and ull be able to buy one 🙂
otherwise yeh life sucks hehe
halogen vrs MH
Those 500 Watt halogen bulbs are real cheap here, too. I think harborfreight.com (and their local store) had them for 99 cents each a few weeks ago!
But they are so long and skinny, I think they will not work very well. That's why I suggested the more expensive 250 Watt halogen bulb I saw at Home Depot. It is not any longer than a 400 Watt MH arc. Even with the shorter filament, I think you would have to put something like a beer can reflector behind it to make it seem a bit wider. Just an idea.
There are all sorts of MH bulbs. Some short-arcs cost hundreds of dollars and run for 500 hours. The ones everybody uses in DIY projectors cost $15-$50 and run for 11000 - 20000 hours. They also need a ballast kit,which costs $45 - $150, but that should last forever.
Halogen bulbs come in different voltages, but the ones mentioned above are for 120 VAC. So they don't need any kind of ballast or power supply at all. For anybody with only 240 VAC power, a similar bulb should be available for that in your area.
Those 500 Watt halogen bulbs are real cheap here, too. I think harborfreight.com (and their local store) had them for 99 cents each a few weeks ago!
But they are so long and skinny, I think they will not work very well. That's why I suggested the more expensive 250 Watt halogen bulb I saw at Home Depot. It is not any longer than a 400 Watt MH arc. Even with the shorter filament, I think you would have to put something like a beer can reflector behind it to make it seem a bit wider. Just an idea.
There are all sorts of MH bulbs. Some short-arcs cost hundreds of dollars and run for 500 hours. The ones everybody uses in DIY projectors cost $15-$50 and run for 11000 - 20000 hours. They also need a ballast kit,which costs $45 - $150, but that should last forever.
Halogen bulbs come in different voltages, but the ones mentioned above are for 120 VAC. So they don't need any kind of ballast or power supply at all. For anybody with only 240 VAC power, a similar bulb should be available for that in your area.
Typical of 100k hrs, basically forever in a projector 🙂
My thoughts on halogen? Too hot, most arent a point source (easily obtainable ones), and the colour temperature absolutley sux for games or anything else. However some halogen arent bad, the very small element ones can give us a very acurate light engine (for what they are) hence a nice and sharp image. With the latter being said the colour temp and heat issues are still a problem, and the small arced semi decent halogen still need a special power supply.
So the best thing to do, is to go out and find the smallest arced mh bulb one can find. Try to find a high colour temp of 5500K +, and try to find a bulb thats 2000hrs + in life. That way you have a very acurate light engine, the colour will be acurate along with contrast, and your heat issues will be gone, (within reason).
The amount of light you need for a small projector is about 10000 - 15000lm. This amount of light will yeald a 350-600ansi lm image, but bear in mind to condense the arc.
Trev🙂
Hi, I am new here, but am trying to get the bal rolling on a cheap projector system for my living room 🙂
I just picked up one of the halogen work lights our local Zellers had and wow, yes it is bright and hot, very hot. I made a reflector $1.15 soup ladle....for the 500 watt halogen bulb and that improved things quite a bit in the light department (at least as far as the dirrection it was pointing, remember this was intended to be a flood light).
I did notice the light was awfully yellow, (like most halogens) so I went to my building supply store and looked around. I found a sylvania 500 watt 500T3Q/CL/BL/119MM that claims to beable to produce "Brilliant White Light". So for $6.95CAD I thought I'd see. Well, it is whiter, much whiter but I wouldn't call it day light....certainly blinding, but not exactly brilliant 🙂
I am hopeing to find an all metal older OHP to use so it won't ******** melt 🙂, and I want to chop a hole in the back of it to aim the whole work lamp in from behind at the mirror that is usually on the front wall at an angle. Taht way I can have a fan exahusting fro the whole projector and one that I am in the process of retro-fitting to my work light cooling the bulb. (I am also a bit paranoid about having the halogen explode and dest fresnel of the OHP.
I plan on going the Pull down vinyl blind route when completed for a screen, as my living room is pretty small.
I just had one other concern though, and that was, how big will my image be if my projector has to be 13ft from my screen? I don't want an 72" projection. I just want something that will rival a 42" plasma for size, but be cheaper than a massive REar projection of the same viewing size.
Any questions comments or help would be appreciated, also cheap sources for LCD's in Canada (I have searched the forrum, but can't seem to find much on the er...cheap side of the fence).
I just picked up one of the halogen work lights our local Zellers had and wow, yes it is bright and hot, very hot. I made a reflector $1.15 soup ladle....for the 500 watt halogen bulb and that improved things quite a bit in the light department (at least as far as the dirrection it was pointing, remember this was intended to be a flood light).
I did notice the light was awfully yellow, (like most halogens) so I went to my building supply store and looked around. I found a sylvania 500 watt 500T3Q/CL/BL/119MM that claims to beable to produce "Brilliant White Light". So for $6.95CAD I thought I'd see. Well, it is whiter, much whiter but I wouldn't call it day light....certainly blinding, but not exactly brilliant 🙂
I am hopeing to find an all metal older OHP to use so it won't ******** melt 🙂, and I want to chop a hole in the back of it to aim the whole work lamp in from behind at the mirror that is usually on the front wall at an angle. Taht way I can have a fan exahusting fro the whole projector and one that I am in the process of retro-fitting to my work light cooling the bulb. (I am also a bit paranoid about having the halogen explode and dest fresnel of the OHP.
I plan on going the Pull down vinyl blind route when completed for a screen, as my living room is pretty small.
I just had one other concern though, and that was, how big will my image be if my projector has to be 13ft from my screen? I don't want an 72" projection. I just want something that will rival a 42" plasma for size, but be cheaper than a massive REar projection of the same viewing size.
Any questions comments or help would be appreciated, also cheap sources for LCD's in Canada (I have searched the forrum, but can't seem to find much on the er...cheap side of the fence).
Oh, here is the link to my bulb:
http://ecom.mysylvania.com/sylvania...ID4001DB0.21193451263996388End;sapj2ee_*=4001
11,000 lumens vs the 8700 of the old yellow one.
http://ecom.mysylvania.com/sylvania...ID4001DB0.21193451263996388End;sapj2ee_*=4001
11,000 lumens vs the 8700 of the old yellow one.
image size
Depends on your LCD size. If you were thinking of using a 5" PSone LCD, then you will probably get about a 56 diagonal image from 13 feet. (Most OHP projection lenses are around 325 mm fl.)
If you use a 7" Lilliput, then you would get a 78" image. You can do the scaling yourself for other sizes.
If you need a smaller (and brighter) image, then you need to either move the projector closer to the screen (or vice versa), or to get a longer focal length projector lens.
Depends on your LCD size. If you were thinking of using a 5" PSone LCD, then you will probably get about a 56 diagonal image from 13 feet. (Most OHP projection lenses are around 325 mm fl.)
If you use a 7" Lilliput, then you would get a 78" image. You can do the scaling yourself for other sizes.
If you need a smaller (and brighter) image, then you need to either move the projector closer to the screen (or vice versa), or to get a longer focal length projector lens.
Thanks for the help, I don't suppose you know if it too easy to take the existing one from and overhead projector and fit a long throw lense from the DIY store? I may have to go that route, as I want to get at least 800x600 for watching dvd's on, and means I'll likely end up with a 14 inch LCD or larger. Hmmm, I'll have to see if it is possible to make a long throw lense from what I am will be getting. Thanks again.
Oh, I have a pic of my "new" fan vent on the back, it actually seems to make a difference, and there isn't that much light leakage from the unit.
Also included some of the light just for fun, I had to put my crappy little camera to "spotlight" setting to view the light at all with the reflector. Please note, that the light appear about much brighter in person (can't look at it at all), and my digital camera is part of my cannon 65mc miniDV. (only 1024x768).
Oh, I have a pic of my "new" fan vent on the back, it actually seems to make a difference, and there isn't that much light leakage from the unit.
Also included some of the light just for fun, I had to put my crappy little camera to "spotlight" setting to view the light at all with the reflector. Please note, that the light appear about much brighter in person (can't look at it at all), and my digital camera is part of my cannon 65mc miniDV. (only 1024x768).
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