Do you want to dim the bulb for longer life?  How about shutting off the
high voltage but keep the filaments on?  Or better yet, some circuit to
gradually turn the filaments on and off.

Sherpa Doug

> -----Original Message-----
> From: Vasile Surducan [mailto:vasile@L30.ITIM-CJ.RO]
> Sent: Thursday, August 09, 2001 2:21 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: How to dim UV light
>
>
> On Thu, 9 Aug 2001, Andre Abelian wrote:
>
> > Hi to all engineers,
> >
> > I apologize if the tag isn't right.
> > I do not know how many of you use UV light for
> > drinking water filtration specially to filter (H. Pylori)
> > bacteria.
>
>   Do you know that heliobacter pylori don't live in strong
> acidity medium
> ? Drink basic ( alkaline ) drinks [ plant-tea (plant read as
> vegetable and
> not factory or power-plant) ] and your body will compensate
> that producing
> more acid. It's verified.
>
>
>  I have setup with 9 pieces of different filters and the last
> > one is the UV light. My problem is that the light is always
> > stays on and it burns every 7-8 months. According to
> > report continuously leaving it on the UV light will last longer
> > then turning on and off. What I am thinking is to dim the light
> > when it is not used instead of turning it off BUT the question
> > is How to dim it.? Does any one know how to dim fluorescent light?
> >
>   You may dim a little the UV tube by decreasing ( 10 to 35 % ) the
> high voltage and keeping almost constant the filament. Usual,
> the nominal
> voltage dropout is about 70...120 V on a standard tube, you may have
> something else there.
> A cheap stepup convertor like those used in high efficiency
> bulbs may help
> you. See some schematics at:
> http://www.geocities.com/vsurducan/neon.htm
>
> Vasile
>
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