The tube is a 4w Blacklight tube. I have used theese in a simple
light-box...
(They are powered by 4x AA cells ?)

I used 3 of theese (3 x 4w) in config about 60mm from glass.  (I should
probably use something other than normal glass from a picture frame...)  The
exposure time for a good exposure is in my setup about 40-50 minutes...

I suspect you can make this a lot shorter with correct glass.

    KreAture


----- Original Message -----
From: "Herbert Graf" <hgraf@EMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, January 12, 2003 9:20 PM
Subject: [EE]: Photo-resist UV Light Source


> 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
> this, in your opinion, useful enough for exposing very small boards (say
> 3x3")? Anybody have an idea as to how long it might take for proper
> exposure? The reason I want to use this is because it's the only "small"
> tube I've been able to find. The only other tube is 4 feet long and MUCH
> more expensive! Thanks for any info. TTYL
>
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