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Old Sep 7th 2018, 10:03 AM   #11
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if this time it works, you will see in the attached pictures the condensator lens I used to focus the led
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adding two (or more) light beams together-img_20160516_192650.jpg   adding two (or more) light beams together-img_20160516_192704.jpg  
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Old Sep 7th 2018, 10:10 AM   #12
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seems it does
this is a 100W led, same shape of the 200W I'm trying to use now
I asked a company about the parabolic mirrors, and they said this can help (I have a similar idea Woody), but they said also the mirror I will need for this will be bigger than the ones they can manufacture and this is expensive to make a test (the mirrors they biggest mirror they manufacture cost about €900), so I was looking for something else...
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Old Sep 7th 2018, 06:48 PM   #13
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Wow ...I can see you have taken this idea quite far practically , eins , well done!

If you remove the heatsink , led and lens from the projector , you will see that by changing the distance of the lens from the led you can focus the beam onto a wall or screen and you will project an image of the led emitter itself ... perhaps you can see details of the led's surface in this image ( you can also do this with zoomable led torches , the emitter is usually square)...

The problem is no matter how you adjust the lens , or what mirrors etc you use, the smallest size of the image on the wall is always dependent on the size of the led surface , and to get a clear image in projecting slides or film this has to be close to a point or you get multiple (blurred) image/s

So it's all about selecting an led with max light from the smallest emitting area ...

The best available to date is this ....



they only consume about 10 or 15W, so are not as bright , but they are small , and so will give you the clearest image posible with leds ....

Last edited by oz93666; Sep 7th 2018 at 09:09 PM.
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Old Sep 8th 2018, 03:20 AM   #14
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The problem is no matter how you adjust the lens , or what mirrors etc you use, the smallest size of the image on the wall is always dependent on the size of the led surface , and to get a clear image in projecting slides or film this has to be close to a point or you get multiple (blurred) image/s
That is what I solved with the condenser lens in the picture above, is a similar effect than Köhler system, with a condenser who has very short focal point and practically the whole led fits on it. I borrowed that lens from an slider projector and adjusted the distance until the image was clear enough.

they only consume about 10 or 15W, so are not as bright , but they are small , and so will give you the clearest image posible with leds ....
they are small, but for what I want I will need at least 50 of these! (I want about 80~100k lumen) may be you have some idea on how to add together 50 light sources easily than 3? (I take care of the cooling system
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Old Sep 8th 2018, 03:41 AM   #15
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maybe not 50 of that, but 100 of this: https://www.cree.com/led-components/...ete/xlamp-xd16

they are small! didn't see it before, now I need to think in how to take out 600W from there
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