Hi,

This is the inital result for my projector. In RL the image is a bit brighter but it is still quite dark at the top. My first thought is to adjust the reflector but before I go fidlling I thought I would see if anyone had similar result and if so, what they did to correct it.

Thanks,

Beekeeper.

Make sure your fresnels aren't swapped. Try reversing them, and making sure the grooved sides face the lcd.

Thanks arris138.

I checked the Fresnels (seems to work for everyone else!!!) but they seem fine, so I did not bother swapping those (The one with larger magnification is closer to the bulb and the other closer to the PJ lense). I did align my reflector up abit.

So then I checked some of my measurements and found the distance from the collector fresnel (330) to the PJ lense is quite out. It is around 400mm to 340mm but not to the 320mm in the guide. How I stuffed that one I dont know but boy do I feel dumb about it.

Anyway so I will have to get my PJ lense to move back to the 320mm and that will require a bit of rework, especially since I have painted it all so nicely.

As I got the distance down to 340mm the brightness around the top did improve but not as brightly at the bottom (see pictures).

I am very keen to hear from someone who prehaps had a simlar problem or who can adjust their projection lense far enough so the top is not so bright. This will at least give me some confidence that geting the PJ lense to 320mm will solve all my problems.

Well I did a bit of hacking and temporarily got the lense back to the 320mm mark. It certainly improved the brightness and I got to focus the image. Still it was a little dark at the top.

So after a checking and tweaking that if I moved the 220 lense lower it became brighter at the top and darker at the bottom. So after a bit of trial and error I (or should I say "Art") I worked found the the 220 lense has to come down around 3mm.

Now the light is evenly distributed.

One thing of interest:

In the second last test I did, the colour of the lamp was fluctuating between a pinkish white and bright white. After the test, I unpluged everything, checked all the lamp connections (everything was fine) and tried again. This time the colour was a constant bright white. I am at loss though to what cause the problem. I have read about 'lamp burn in' but usally the colour reported is green. Has anyone experienced a pinkish one?

Below is a picture of the projected image with even brightness. And below that is one when the globe was showing the 'pinkish' white I mention earlier.