I'm building a cheap UV exposure frame using a gutted flat scanner unit and putting in a UV setup so that UV light will travel through the scanners glass and then hit the board.. it would all be weighted down by a 2-5lb metal weight attached to the top of the the top. Question i have is will UV LED's be as effective as UV bulbs?
none none skrev:
You will need a lot of LED to get the same effect as a fluorescent tube. Taking in to consideration that UV LEDs are much more expensive the fluorescent tube, the choice is easy.
-- Hilsen Mikkel Lund "Sund fornuft, har aldrig stoppet en tosse" Jokeren i "Mænds ruin"
"none none" wrote in news:45cf2278$0$24720$ snipped-for-privacy@roadrunner.com:
One thing to think about is the transmission of UV light through the scanner glass. I'm not sure what type of glass is used, but there is a sever loss at the shorter wavelengths in all glass.
There is a chart on transmission vs. wavelength down the page.
Though I have heard, somewhere, that the glass used in some copier beds has a relative high transmission rate.
Just something to consider.
Ken
Try a sheet of acrylic. Thats what they use in tanning beds. It passes the short UV well.
Tanning beds use long wave UV. Most plastics are unsuited to UV light.
Quartz glass if you have a choice.
I had a cheap exposure frame and the glass didn't appear very special.
-- ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
-- ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
Is that flatbed scanner the usual off white plastic? If so, it will not stand up to high levels of UV light for long.
-- Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.