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I am going to re-upload this. It blanks out early on a few times and doesnt show the picture I posted properly. If anyone has a good lead on an i7 laptop please let me know. My HP is showing its age. Its not a good editing machine.
In this video I go over the how's and why's for DLP light tunnel adjustment. Sometimes these parts are called an integrator, or a light rod. Its a small piece of glass or set of mirrors that collimate the light into a solid beam without an uneven brightness. It points that light on to the DMD via the shape lens and/or mirror. When the tunnel is out of alignment, you will see a shadow and sometimes a rainbow artifact that follows the shadow. Almost every DLP projector made has one of these and they can and do move over the thermal cycling of the projector. I have replaced them before but sometimes they just need an adjustment and hopefully this video clears up the specifics.
As always if you have any questions about it, please post them below.
Thanks again for watching and stay safe and healthy out there. I hope to go back and edit this description once Corvid19 is past us. Take care- Frank