July 20th, 2015, 02:18 PM
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#7 (permalink)
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Senior Member
- Join Date:
- Jun 2011
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- Auckland, N.Z.
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Re: LED Exposure Units
I am kind of curious. The fluoro units were dogs and didnt really take on. The specialist manufacturers of Amergraph and Richmond Graphics dont make or look at these. The physics of light suggest that single point is less undercutting and also more directed stronger light.
Glass looses UV strength actually quite significantly in lower strengths, and the bulbs are close to the glass. So maybe you have 3,000 bulbs, but they are very small in output, and maybe you are making a screen where the small frame is say only 20% of the size of the exposure unit = it is sitting over 600 lights only therefore is receiving light at 20% strength of the units output. If every bulb was rated at one watt, the unit may be 3KW, but in effect the exposing area of the screen is in effect only 600 watts - the effect of the glass. Where if it was on Richmond single point bulb it would likely be getting 75% of the 10kw strength. The exposure may still be quick, but I question the hardness, and how the bulbs deteriorate. LED has a dropoff with wavelengths and as well the rating is affected by turning the unit / power on and off. I would love to see the science on these!
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