From: Neon John <johngdDONTYOUDARE@bellsouth.net> Newsgroups: sci.engr.lighting,sci.engr.heat-vent-ac Subject: Re: ozone generating lights Message-ID: <qo3u7u47gv7uiad0h0o3j58ke3o79gd1c5@4ax.com> Date: Fri, 01 Mar 2002 00:24:01 -0500 On Tue, 26 Feb 2002 09:20:02 +0200, Ioannis <morpheus@olympus.mons> wrote: >lopi wrote: >You could also use the following, although WARNING! it's NOT recommended >and it's dangerous!!! > >Use the quartz tube from a regular 80-400W HID mercury bulb, but INSTEAD >of connecting it in series with its appropriate inductive resistance, >connect it in series with a 30-50 KOhm regular resistance. Under those >circumstances, the quartz tube will operate in glow discharge mode, so >the visible light will be minute, but a considerable amount of >ultraviolet radiation will be generated, enough to fulfill some of your >needs. But be VERY careful, even this little UV can badly burn your eyes >and skin before you can take notice. An even better solution is to get a low voltage neon sign transformer, say a 3500 volt, 20 ma unit and drive that quartz tube with it. These little transformers are cheap - about $25 - and won't waste power or make lots of heat like the resistive solution. Plus the tube will always light. I use just such a setup to cure UV epoxy in my glass shop. Works great. One little correction - this setup makes a LOT of shortwave UV. Most folks know about the eye hazard but most don't know just how quickly the ozone produced on the surface of objects illuminated with this stuff will damage things. One can bleach the color out of fabric in hours. Ditto for dye-based ink. Many plastics will turn brown within a day from surface oxidation. this means that the tube should be operated inside a metal enclosure that blocks the emitted light. Just blow air through the enclosure to produce the ozone. john --- John De Armond johngdDONTYOUDARE@bellsouth.com http://personal.bellsouth.net/~johngd Cleveland, Occupied TN |