DIY Video Projector Part II

[echow87]

Originally posted by prjctr_builder
omg, it took me about 10 hours of work today just to instal my lightsource into my projector's enclosure. I finally recieved my ballast on Monday and was making plans of my projector to be... I ordered 2 ballasts from ebay, a 250W ballast and a 400W ballast. They both cost me about $60 and the 250W ballast works pretty well. They are both new. The bulb that i got off of ebay, 250W MH 4200K and i think 22000 lumens also keeps me very much satisfied *knock on wood*. As to my LCD, i am using viewsonic 15" XGA lcd. it came apart alright, but the ribbon cables are a little flexed in my construction. About 30 minutes ago, i tested the whole "prototype" that is for now held together my duct tape, and still, i got a bright, sharp and very good looking image. I did not get a chance to connect it to my computer, but the BLUE color in lcd menu, was the sharpest blue color i have ever seen. It looked about 5-10 times better than the color i got from dukane quantum and Sharp QA-2500. I will work super hard tommorow to try to install the optics and the LCD in place permanently...

that's all for now


good luck all

Wow,

Awesome, you say you got both of those ballast for only $60? If yes, good find.

[verbose mustafa]

The projeciton lens will project an image over 10 feet at only 37 inches! What a zoom lens! Don't worry though, it will only work with a 4" lcd panel .

[chbright]

why will it only work with a 4" panel verbose. if u put the back of the lens where the fresnel's foucus point was wouldnt it work.

[cohort36]

OK, I know I'm new posting here, but I've read all of the original thread and am most of the way through this one. I have searched this one through current postings for LED related posts, and have read the seperate LED thread.

That said, I am wondering about the Luxeon Star (1W) LED's. Everything I have seen has ruled these out as too expensive per lumen or not creating enough lumens. The specs list these at 25 lumens. I think that a higher percentage of the lumens would be usable as compared to a MH or other bulb, because of the fact that the light is collimated (by the optics) and is perpendicular to the LCD. Secondly, if price were not an issue, do you think these would be a viable option? I may be able to pick up a LOT of these very cheaply.

Any feedback or ideas?

[echow87]

Originally posted by cohort36
OK, I know I'm new posting here, but I've read all of the original thread and am most of the way through this one. I have searched this one through current postings for LED related posts, and have read the seperate LED thread.

That said, I am wondering about the Luxeon Star (1W) LED's. Everything I have seen has ruled these out as too expensive per lumen or not creating enough lumens. The specs list these at 25 lumens. I think that a higher percentage of the lumens would be usable as compared to a MH or other bulb, because of the fact that the light is collimated (by the optics) and is perpendicular to the LCD. Secondly, if price were not an issue, do you think these would be a viable option? I may be able to pick up a LOT of these very cheaply.

Any feedback or ideas?

Heh...

LEDs' will not work. They arent bright enough. If I were you, just get a MH ohp on ebay or get a lighting kit, maybe a 250 watt double ended?

[verbose mustafa]

LED Stands for:

(L)ittle (E)xpensive (D)im

[cohort36]

So are there any specific suggestions/recommendations for using MH? Is 250W (assuming a decent reflector and/or condensor setup) enough for a 5" LCD? Or is 400W the way to go? Is the only choice those big 8" M59 bulbs, or is there anything smaller? I've seen some double ended bulbs that are smaller, but I haven't found a place where I can get a setup for that for anywhere near a decent price. Thanks again.

[prjctr_builder]

I have been building my projector for past 2 weeks now, and i got LCD, and lightsource insytalled already in a pretty nice, but kinda big box. I am about to install LCD controller and fans in the box and i will be all set. Opps, almost forgot, i need to attach my objective to, but it is kinda tricky, sicnce i wanna have a moving objective to adjust focus on my projector. I am running a 250W HM bulb, and i am testing my setup on the white wall about 3 feet from the objective. eventually, i will have my screen about 15-18 feet away from the objectives and that is what worries me. So far, the brightness is perfect, but what will happen when i move my projector 5 times further away from the screen? Will the 250W bulb provide enough light?

P.S. I built a very nice reflector from sheet of steel tha ti got from home depot...

[Mavmesa]

prjctr_builder

Here is how I got my triplet lens fixed in a lens board and attached that to an old OHP focusing arm.




Normally, I have a cloth shroud that covers around the lens board, almost like a bellows on the old photographic equipment.

Mavmesa

[pashiran]

i knew this site just a minute ago

Im Korean and forgive my poor English plz.

Korean started DIY projector about 1years ago.

but made good projectors many

just come and look.

http://club.wassada.com/diypro/iclub.asp?code=3

that link is pic board. of course language is korean but you can see pics.