Homebrew PCBs

DJ Delorie wrote:
> Just finished wiring mine up...
> 
> http://www.delorie.com/pcb/uvled/
> 
> I layered the LEDs between two sheets of plywood hoping they'd keep
> things aligned, but not quite good enough I suppose.  Time to fiddle I
> suppose.
> 
> I happen to have a lab-grade timer to run it with, too.
> 

Nice work

Whats the grid pitch ?
Whats the LED brand/model ?

I'm interested in your exposure times. I get 60 seconds with negative 
dry film, grid density 0.28 LEDs/cm^2, BestHongKong 390nm UV LEDs at 
20mA, about 100mm PCB to LED gap, measured with inkjet transparency + 
5mm window glass in light path.

Adam