DIY Video Projector Part II

[mikekniner]

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?

[diylabs]

Originally posted by mikekniner
o ya alan you gotta advertise that site of yours in every post lol?

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

[mikekniner]

Ya don't worry about it, just a small thing I noticed that I wanted to bring up lol

[copasetic]

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...

[The Alchemist]

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 :P. I thought they are quite nice .



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[dj_crisis]

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

[diylabs]

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.

[mathias]

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.

[ace3000_1]

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.

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

[mathias]

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.

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.