Homebrew PCBs

Barry,
I have also been thinking about a UV led box. Five minutes seems ok to me. Can you describe your LED array? What sort of spacing do you have on the LED array and distance do you run between the board and the LEDs?

Craig

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> Barry Demers <sdad@...> writes:
> > I have been using a single bulb 12" from a 6 x 9 board, with a 24
> > min exposure.
> 
> A single 15 watt bulb?
> 
> I've been pondering upgrading to two-sided UV exposure, but my LED box
> exposes in only 5 minutes.
> 
> Can you reduce the exposure time by using mirrors to reflect more of
> the UV light to the board?  I.e. something behind the bulbs, or the
> sides of the box.  Or is it just going to mess up the quality of the
> exposure?
>