Getting no projection, tried messing around alot with fresnel, no results... plz help

[CitrusXt]

Hi! I've been using these boards since I began my DIYP project... I've succesfully stripped my lcd, extented an FCC connection, but now I'm stucked and confused when it comes to actually projecting the image.

Here is a quick list of what I'm using:

> 500W 8500 lumens halogen bulb w/ *rectangular* reflector. ( it's a yellow painting/contruction lamp I found for cheap, I have spare bulbs )

> 15'' LCD Fujitsu 16ms 300:1 contrast ratio Panel

> Lens kit from lumenlab.com (2 fresnel + proj. lens)

Here is a small ASCII plan of my actuall setup:

<Lamp+Reflector> 22 CM <Condensor fresnel> 2CM <lcd panel> 2CM <field fresnel> 35CM <LENS or test paper>

So here are my results:

nothing, I tried switching fresnel positions, distances, lamp distance, lens/paper position... notjing actually got me ANY picture >_<

the ONLY way I actually got anything was from putting a white paper in front of the LCD with the light on, I got a direct copy of the lcd, but duh, this just proves that some light passes in the LCD panel...

I'm guessing it might be my reflector that's not round in shape? but damn why is there absolutly NO signs of ANY projection, ... I'm getting a bit crazy as this project took me to much time as it is... I'm desperate for your inputs.

Thanks for reading!

[Stocker]

Numbers? I didn't see any focal lengths in that.

[CitrusXt]

Originally posted by Stocker
Numbers? I didn't see any focal lengths in that.

standard lumen lab material

22CM colimator

33CM collector

32CM Projection lens

[Stocker]

Ok fair enough. I have never built my own projector or done the maths so I'll leave that to others; I just thought it would be helpful to someone who knows what they're talking about, to have something about which to talk.

BTW, you don't have any of the lenses reversed, do you?

[shardian]

Just to let you know, that halogen is nowhere near powerful enough to be a light source for a 15" PJ. You need at least a 250W MH. I am trying to get rid of a 400W MH bulb and ballast, and that would definitely be what you are looking for.

Just to give you an example of your problem: I am using a 175W MH bulb that has around 10,000 mean lumens. It is just good enough for a 5-7" PJ. Your 500W halogen only produces 8500 lumens. A 400W MH gives roughly 30,000 lumens if I remember correctly.

[Whatmo]

The diagnal of your lcd makes little difference, it is the size of your projection that affects brightness.

[CitrusXt]

Originally posted by shardian
Just to let you know, that halogen is nowhere near powerful enough to be a light source for a 15" PJ. You need at least a 250W MH. I am trying to get rid of a 400W MH bulb and ballast, and that would definitely be what you are looking for.

Just to give you an example of your problem: I am using a 175W MH bulb that has around 10,000 mean lumens. It is just good enough for a 5-7" PJ. Your 500W halogen only produces 8500 lumens. A 400W MH gives roughly 30,000 lumens if I remember correctly.

mmm... look at this thread. Simple halogen light question...

[snortonnorton]

yeah, that's enough light to see it..........

[politicorific]

what are the ambient lighting conditions? Can you post a picture of your current setup?

Something may not be lined up correctly, but in daylight I couldn't tell how bright my Metal Halide was and thought I'd screwed something up.

[CitrusXt]

Hi! I've tried with virtually no light, I still don't get any results...

here's a pic:


like I said I tried putting both fresnels on each side, at multiple distances, maybe someone could tell me their exact ones?

so, it seems that my super hot light does not really suffice - crap. I'll search for another one, but those light kits at lumenlab are way to pricey for me, 150$+ without a relector? o rly..