Cooling a DYS bulb

[tjh]

Haha, didn't mean to be facetious, just making sure.

After thinking about it, maybe your fresnel is upside down, because my lamp certainly does not have to be at the bottom of the case to work. Just a thought. Might just be a bad mirror though.

[Tritoch84]

Thanks for the help, I'll flip it, see what happenes, then buy a new mirror (where? home depot cut to size im' guessing.).

[tjh]

The problem with getting a normal mirror at home depot or somewhere is the reflective part is behind the glass, so there may appear to be a "ghosting" when projected. So if you do go that route try to get the thinnest you can as that will have the least glass, or just get a frontside mirror which is preferable.

[avnerd]

I have just come across one of these projectors as well. Mine is a Dalite Portascribe. I, too, was suprized when I looked up the lumen rating on the bulb. I have some A.V. connections, so I have used my panel with a couple of different OHP's. One was an Elmo - ???? (can't remember the model no. which used a 82v 410W FXL bulb. And the other was a 3M with a 500W - ??? bulb. Both Halogen, and both had similar, likeable results in a dark room.
My panel is a 3M 6100 (640 x 480 [800 x 600 compressed], 16.7M colour, 30ms reponse)
I'm just using it for the Xbox, and movies. My only complaint is the colour temp. out of OHP halogen bulbs. The DYS bulb has the same 3200k colour temp of all the other OHP bulbs. This becomes very obvious when you watch a movie without a lot of colour contrast like The Matrix.
The only thing that keeps me from building a HID light source behind my panel is the fact that I am challenged for storage space, and projection throw distance. This, coupled with the fact that my wife doesn't even like the look of a shiny new T.V. in the living room, keeps my home theatre dreams held at bay.
I thought that I would try to build a silver screen to try to get some more gain out my setup, but if anyone in this post has ideas on how to get truer colour out of a 3200k light source, I'd love to hear from you!

[Tritoch84]

I am having this problem as well, the darks are to dark and the lights are to lights, but not enough color, it's kind of been a pain in the butt. In some movies, it's extremly dark when it shouldn't be, I'm going to try and find a way to make this setup work however. I don't have the money right now to get or build a new better light source.

[avnerd]

Have you posted any results? I haven't had a chance to test my setup. Hopefully, I'll get it setup tonight. If I get a pic, I'll put it up in this post.

[Tritoch84]

Someone should contact the person that uses the nView Spectra C + Apollo A1-1000 in the pic in the "show your results" thread, he's mentioned with his setup on the first page.

I don't know if he's had the same problem though.

The bright spot in the middle IS from the little reflector at the bottom of the bulb, I'm guessing because I have it set so low.

I'm still trying to get good color. I thought it was a lack of contrast, but that isn't the case. In some 3-D games, it becomes so unbearbly dark you can't make out anything, and to make up for it, I have to sometimes turn the birghtness up so high to see the details it's very annoying. I'm throwing from 12 ft, or less I think. In a snowboarding game, the caves where to dark, then you get out into the snow and your image is pure white with no details in the snow....

Ah well, I like tweaking everything, just keep the posts coming! Maybe we can help anyone else that is using a DYS setup.

[tjh]

No luck flipping the fresnel Tritoch?

I personally haven't noticed any bright spot in my image, although I'm waiting on new fresnels, so any extra brightness in the image might be cut out by the white film that has proven impossible to remove from the lower fresnel.

Might also be that I split the fresnel. That may help with the bright spot. I went around with a tiny flat head screw driver and a hammer carefully breaking away the sides bit by bit, but I'd suggest just cutting off the glued part on the edge if your gonna try it as doing it my way left a lot to be desired. (It did work, but left sharp edges, a few minor cracks here and there etc.)

[Tritoch84]

Ok, here are some (not so good) pics I took with a borrowed digital camara. It's a *little* brighter then the pictures, but not by much, I would like it MUCH brighter, but I still haven't gotton a replacment mirror, and I need to just check to see if the fraynel is flipped, someone said it wasen't, but I might as well try (would this explain it only being out of focus on the top?) since the bulb has to be at the bottom to project a good image, which is annoying since the reflector at the bottom makes a birght spot in the screen.


This is the setup, or rather, what it looked like before we put a legnth of white PVC on the bottom to straiten the wrinkles out and to make it easy to roll up to the ceiling while not in use.


Here is the projected image from a paused anime.


Here is my 4ft 11in wife showing the size of the image.


And here is a shot of the OHP I am using. (And my retarded dog.)



thats about it, look a little dark to you guys? I'm using blackoutcloth, but it still doesn't look to bright. Maybe I missed a layer of something when I was cleaning it out when I got it (it had a THICK film of dirt on the top, and maybe I missed something underneath, even though I was sure I got everything.)

[tjh]

It does look a bit dark. But that all depends on how far away the projector is and how big the image is. Did you play with the settings on the actual lcd at all? Also light leakage cuts down on the perceived image quality a lot, as eyes (and cameras) will compensate for the extra light.

I would definitely try flipping the fresnel, its no big deal, just lift the plastic top frame, pull out the clip and flip it. If it is in fact upside-down that may help with brightness, not sure though.

Looks really good though coming out of an Apollo AI-1000 with only a singlet lens.