screen printing > DIY - From master engineered marvels to cobbled together jury-rigged or Jerry-built junk!
DIY LED Exposure Unit
mimosatexas:
Based on the last image, isnt the glass pretty far from the bulbs? Arent most of the LED units closer to like an inch or two from the glass vs 4 to 6 like in the image?
blue moon:
--- Quote from: mimosatexas on January 23, 2018, 12:19:00 PM ---Based on the last image, isnt the glass pretty far from the bulbs? Arent most of the LED units closer to like an inch or two from the glass vs 4 to 6 like in the image?
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glass distance has to be calculated based on the cone angle. It should be set up so there is a correct overlap from each LED without undercutting from the side bulbs. This is part of the reason why some of the manufacturers are just making really crappy units. They have field intensity variation of over 20% (in one case almost 40%!!!). Imagine having a stencil with weak spots throughout the image from being underexposed by 40%!
pierre
mimosatexas:
I know it requires calculation, but I thought one of the major benefits of using these LED strips is the dense clustering of the LED meant the sweet spot was significantly closer than something like a flo bulb unit. I cant find any useful info on the angle of the cone from these kinds of strips, but I would assume its somewhere around 20 to 30 degrees, which should result in something between 2 and 3 inches away max. All speculation of course without actually testing.
blue moon:
--- Quote from: mimosatexas on January 23, 2018, 05:19:28 PM ---I know it requires calculation, but I thought one of the major benefits of using these LED strips is the dense clustering of the LED meant the sweet spot was significantly closer than something like a flo bulb unit. I cant find any useful info on the angle of the cone from these kinds of strips, but I would assume its somewhere around 20 to 30 degrees, which should result in something between 2 and 3 inches away max. All speculation of course without actually testing.
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I’m guessing you might be able to get something as low as 45, but almost all are around 120. That makes for a lot of undercutting if the distance is too far.
Pierre
mimosatexas:
if the angle is 120, that would mean the ideal distance sits closer to an inch away max unless im missing something
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