Hmmm, I always assumed that the "blue light" device used to cure dental adhesive was actually a UV source which just happened to "spill over" into the visible spectrum and produce a small amount of visible light. Sean On Mon, Jan 14, 2013 at 8:39 AM, RussellMc wrote: >> I have also seen white LED that are >> capable of being used for exposing UV film on PC boards so those LED >> have to be outputting some UV as well. > > Photon energy increases with decreasing wavelength. "Royal Blue" is > energetic enough to do much of what UV does. > > Note use of blue LEDs to cure dental fillings. > > The most efficient blue LEDs how have over 1/2 the DC input energy > output as light. > > > > Russell > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .