Hey, ya you can more or less cut your fresnels with a router, when done properly the fresnels wouldn't be damaged, o ya alan you gotta advertise that site of yours in every post lol?
mikekniner said:
Yeah *scratches head* sorry about that. In this case I really was trying to help. I've been mentioning my URL a lot recently because I've disappeared from google all of the sudden. I used to be ranked #4 when you did a search for "DIY Projector", but then one day I ceased to exist under that search criteria. When I contacted google, they suggested that I pay extra to have my listing shown at top on the side, which I tried for a while, but it's just too expensive for me. I'll try not advertise in here unnecessarily 😉
Hi, I just joined, and before reading I will keep this small...I didn't see much on the super cheap flourescent bulb idea that Kevin Wyatt did, but he is here somewhere, since I got this link from his website. I have a Barco that is working fine, but since it will cost more than a new computer (and a car) to replace, I decided I had better get with finding a replacement... 🙂
Fun pics
Hehehe, my light is not that parallel as i thought 😀. I accedently projected the bulb on my roof (10 feet away). So not completely parallel, but a focal at ~9 feet away is parallel enough.
But i made some pics so we can look at the beautifull arc without the change of getting burned 😛. I thought they are quite nice 😀.
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Hehehe, my light is not that parallel as i thought 😀. I accedently projected the bulb on my roof (10 feet away). So not completely parallel, but a focal at ~9 feet away is parallel enough.
But i made some pics so we can look at the beautifull arc without the change of getting burned 😛. I thought they are quite nice 😀.
An externally hosted image should be here but it was not working when we last tested it.
zoom:
An externally hosted image should be here but it was not working when we last tested it.
Hi everyone!
I've been reading up on the DIY LCD projectors, and think I could build one. I'm pretty handy with a circular saw and soldering iron! The setup i'm going for will be quite compact, which is always important...
I do have a question though. I was thinking about setting it up using and LED light source with a slight diffusing lense (lightly-frosted plastic) above them, then reflecting off a 45deg mirror into the LCD panel. You might have covered this, but I was just wondering what you all think?
Anyway, apologies if i sound like an idiot, and I hope you can help me with my new project.
Aaron
I've been reading up on the DIY LCD projectors, and think I could build one. I'm pretty handy with a circular saw and soldering iron! The setup i'm going for will be quite compact, which is always important...
I do have a question though. I was thinking about setting it up using and LED light source with a slight diffusing lense (lightly-frosted plastic) above them, then reflecting off a 45deg mirror into the LCD panel. You might have covered this, but I was just wondering what you all think?
Anyway, apologies if i sound like an idiot, and I hope you can help me with my new project.
Aaron
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RE: LED light source
I love the idea of using LEDs, but I just don't think that it will work. Recently I tried using an LED cluster to test whether they were feasible and found that they had neither the output or the CRI to work well. I was using 16,000mcd LEDs. If you want to read more, I have a thread about it at www.diylabs.org/projector/forums.htm if you want more reading or if anyone else wants to post their experience as well.
I love the idea of using LEDs, but I just don't think that it will work. Recently I tried using an LED cluster to test whether they were feasible and found that they had neither the output or the CRI to work well. I was using 16,000mcd LEDs. If you want to read more, I have a thread about it at www.diylabs.org/projector/forums.htm if you want more reading or if anyone else wants to post their experience as well.
The LEDs idea is great, there are some new super bright white (5500K) LEDs that puts out 80 lm eath. So you only need about 125 of them to get 10000 lm and they last least 100000 hours. Unfortunaly this story has a bad end, the price. One LED cost about $18 + Vat, 125 * $18 = $2250 + Vat.
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Its also not a point source so maybe you could use just the 1 frensel, those leds mathias are big, about 1/2inch round each lol.
Trev
Who have said anything about a pointsource ? We are talking about LED clusters, you can get those LEDs with a lens that have a spreading angle of 10 degrees, with that lens they give 576cd, compare that with those 16cd LEDs diylabs tested. Yes they are big 1" with the lens, but you don´t need so many of them. If you want a pointsource just use a fresnellens over the LED clusters.
I haven´t tested this and I don´t plan to do it either, I don´t have $2000 to spend on this, but if you have, please tell me if it works. In the future when the price have decreased, I think this will be an incredible lightsource, 100000 hours lifetime, you don´t live forever but they do.
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Yeah i agree with no frensel its fine, but the only problem that may acur is the hotspoting from each led through the lcd, if the angle is wide enough on each led we may not get this effect.
Just to add to the thoughts though, i can get a frensels lens here that is actually manny frensels in the one sheet, from memory they are 1 inch across so maybe they would work to create a large evenly lit backlight.
If i had the money sure id be in the testing too, but when i can buy a metal halide setup for way less , why bother lol, yeah yeah ok heat and life ect but still i wouldnt pay 2k for a light source.
I got my light today btw and thanx, it got here in 1 peice.
Trev
ace3000_1 said:
Indeed - $2k would be much better speant on a xenon system like movie theater light booths use, though it's been a while since I priced them (maybe there not as expensive anymore?)
Duno about going down in price, all the things i see these days go up in price lol.
Xenon would be nice but then we have the issue of heat, more so then metal halide unfortunatley, but yeah xenons are nice.
Trev
xenon's
i was thinking of using a xenon for a while till i talked to my roomate. he is a theater projectionist so he took me up to the booth and we looked at the projectors. There is absolutly no way we could use even a smaller xenon bulb, 1) the heat is much much to high (and the fact that if you get hand oils on them they will explode
) and 2) the power required to run a xenon bulb would cause your power bill to skyrocket. Ive currently been looking at using the 400w HQI bulb from alan (so far with the psyudo ace/t800 and my design it should work quite well, i cant wait till ace releases his design so i can use some of his design ideas (i dont care how much his plans cost I WANT THEM!!!! lol)
X
i was thinking of using a xenon for a while till i talked to my roomate. he is a theater projectionist so he took me up to the booth and we looked at the projectors. There is absolutly no way we could use even a smaller xenon bulb, 1) the heat is much much to high (and the fact that if you get hand oils on them they will explode
) and 2) the power required to run a xenon bulb would cause your power bill to skyrocket. Ive currently been looking at using the 400w HQI bulb from alan (so far with the psyudo ace/t800 and my design it should work quite well, i cant wait till ace releases his design so i can use some of his design ideas (i dont care how much his plans cost I WANT THEM!!!! lol)X
I use the xenon bulbs in surgical illuminators at the hospital that I work at. Heat is a major problem. On the higher wattage ones, there is more heatsink in the bulb area than bulb. And one finger print on the quartz, and KABOOM!!
mathias said:
Not true really. ENH is ansi spec for a 250watt TUNSTEN Halogen bulb with integrated IR UV filter 25o mr-16 refletcor. They give lumen ratings though nto easy to find I had to search. TWO as a matter of fact. One for filiment. One for focused beam of reflector. ENH, is 15,000 lumens (at filiment) 65% relative brightness (beam light) 9,750 lumen beam. Not candles. All pj bulbs use IR/UV dichrotic refelctors to remove heat. Not sueing one forces us to use hyper cooling and have hot panels. I totally agree with ya on that. I too after about 3 years (was "tinker" at first here) have done NOTHING but play with light engines. Sad as that is. I foudn out lots of stuff. Very interesting and major payoffs. My brightness is nothing even compairable to the original images I got. LOL. I can get a tiny 50watt EXT bulb to work with a 5" panel, have two windows without blinds on them shinning light in, 4 40watt bulbs on and still see a Image! With lights off its pretty good-wouldnt WATCH it though. Was a test of some ideas I had and I need a low watt non blinding mr-16 reflector bulb to do it. I wouldnt think about actually desinging around it. LOL. The 250 tungsten halo is for that. I also found mr-16 to be a key reflector. I have also used 2 bulbs at once with good output useing them. A 2" diameter reflector is really controlable. One is still best as no glare that way. If two-must use glare filter.
Also if anyone interested. I found a chart of what o beam is what size at said feet. Nice to know how big beam of light is. I scaled it down to inches even. Mine is 5.6" FD for ENH. So beam smallest there. Then goes back up. Good spot for removing heat with my little setup.
😉
I really don´t understand what you mean ? I hope you or someone else can explain this.
Here is some exemple what the lumens output of some bulbs are:
50W 12V Halogen 4000h 930 lm
100W 12V Halogen 4000h 2400lm
250W 24V xenon-halogen 50h 10000lm
400W 36V xenon-halogen 50h 14500lm
150W HQI 12000h 12000lm
250W HQI 12000h 20000lm
Sure you get a brighter beam with a reflector, but not more lumens. When you use a reflector the light beams concentrates in one direction and light what goes in one direction is measured in candels not lumen.
If you put a 1000lm bulb in a reflector and then change it to a 20000lm bulb, which is brightest ?
Here is some exemple what the lumens output of some bulbs are:
50W 12V Halogen 4000h 930 lm
100W 12V Halogen 4000h 2400lm
250W 24V xenon-halogen 50h 10000lm
400W 36V xenon-halogen 50h 14500lm
150W HQI 12000h 12000lm
250W HQI 12000h 20000lm
Sure you get a brighter beam with a reflector, but not more lumens. When you use a reflector the light beams concentrates in one direction and light what goes in one direction is measured in candels not lumen.
If you put a 1000lm bulb in a reflector and then change it to a 20000lm bulb, which is brightest ?
