The square version shows better brigtness, but the left and right edges become little bit yellow.
Condenser Lens : square-shaped lens from, also available in (around 25USD), or you can use conventional round-shaped lens. Not that bright, so you need a dark room. Here is the link, and it runs at 100 watt. One seller in sells this LED and corresponding driver in 185USD. This will solve every focusing issues that happen in DIY projectors. Fancy way : Nobody tried this LED to make DIY projector as far as I know. It leads to blurry image at edges and corner points. I do not recommend this conventional cheap version. Alternative is 128watt in (around 57USD), you should find a proper LED driver. Conventional way : 150 watt LED from with heatpipe. Projection LENS : F190 (F200 is also ok) (you can find this in ), this also costs less than 50USD. Fresnel LENS : focal lenth 120 and 185, F120 is placed near LED and F182 is placed near the projection lens (you can use local stores, or you can find several sellers selling fresnel lens in ) this costs less than 50USD. (around 100 USD in Korea including lazer cut & tapping screw holes) Some explainations are written in Koreans in the files, and it is about tap-screw sign. Case (Housing) : black arcryl with lazer cut, and one side is sanded beforehand (you can use spray), for someone who wanna save his time, I attach AutoCad files that I made. We do not need the BLU as we will use LED light source. You can ask them to separate a backlight unit (BLU). LCD and LCD HDMI board : 5.98 inch, 2560x1440 resolution from (around 200 USD) or you can use other small 2k LCDs if there is a proper board. In my case, I used "" as it is usually cheaper than. Many necessary stuffs were from China, and I am lucky to get those stuffs easily here in Korea. 
The original posts are in my blogger ( link1 & link2) in poor English, and in my Korean blog.
#Diy projector how to
This instruction explains how to make a DIY 2k resolution (2560x1440) beam projector.
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