> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Peter L. Peres
> Sent: Sunday, January 12, 2003 15:48
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Photo-resist UV Light Source
>
>
> On Sun, 12 Jan 2003, Herbert Graf wrote:
>
> *>Just wondering if anybody might have an idea as to how "weak" a UV light
> *>source will still work for exposing pre-sensitized PCBs. I
> purchased a small
> *>UV light (actually battery powered but easily adapted for mains
> power). It
> *>has a UV bulb marked 'H-F4T5BLB(3)' First off, does the 3 mean
> "3 watts"? Is
>
> Lamp codes go like ABCD (as in F4T5) and the meaning is:
>
> Letter A:
>
> F = fluorescent, i.e. has luminophores applied on or inside the envelope
> (can be colored, f.ex. blacklight, which yours is. This NOT what you want
> for boards and photoresist exposure)
>
> G = germicidal/bare glass, uv transparent (this is what you want for
> boards)

        Thanks for the info, however this completely contradicts what I got from
this site (supplied by a fellow PICLISTer):

http://www.netcomuk.co.uk/~wwl/pcbs.html

"The UV tubes you need are those sold either as replacements for UV exposure
units, insect killers or 'black light' tubes for disco lighting etc. They
look white or occasionally black/blue when off, and light up with a light
purple, which makes flourescent paper etc. glow brightly. DO NOT use
short-wave UV lamps like EPROM eraser tubes or germicidal lamps, which have
clear glass - these emit short-wave UV which can cause eye and skin damage,
and are not suitable for PCB exposure."

Which is correct? :)

Thanks, TTYL

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