Homebrew PCBs

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?