Homebrew PCBs

By deafult black light is the light has to be safe on eyes. Then the 
question is about the wavelentgh sensitivity of the PCB and what is 
coming out of Black Light. The opinions on the web are devided with 
60% of them against it. Is there anybody who used Balck Light lamps 
and what was he exposure time? Mike



--- In Homebrew_PCBs@yahoogroups.com, "Leon Heller" 
<leon_heller@h...> wrote:
> 
> ----- Original Message ----- 
> From: "mikezcnc" <eemikez@c...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Tuesday, January 20, 2004 7:01 AM
> Subject: [Homebrew_PCBs] Re: UV light sources question
> 
> 
> > Leon, how long does it take you to expose the PCB?
> 
> I have mine about 20 cm away from the PCB to get a sharper image, 
so I use
> 13 mins. It depends on the distance, of course. Over-exposure 
doesn't matter
> so much as under-exposure. Test with some artwork and expose 
progressively
> with a cardboard mask, moving it every minute, to get the correct 
exposure
> time.
> 
> 
> >
> > Disco tubes (Black Light) are mentioned on the web all the time 
but I
> > think they have the wrong wavelength for PCBs.
> 
> They will work, I think, but aren't as good as the proper ones.
> 
> Leon
> --
> Leon Heller, G1HSM
> Email: aqzf13@d...
> My low-cost Philips LPC210x ARM development system:
> http://www.geocities.com/leon_heller/lpc2104.html