Homebrew PCBs

derekhawkins wrote:
>>Without the reflector and beam collimation, you'll need a bigger 
>>globe for the same exposure time.
> 
> This is more to do with focus than collimation. Parallel rays would be 
> better than divergent rays but convergent rays would even be better 
> than parallel rays if shortest exposure time was the only goal.

That's just a roundabout way of saying you get the fastest exposure by
focusing all the light to a smaller area, maximizing the power density.

I designed the reflector to give parallel rays, and the result shows as
an even power density of the size larger than an A4 sheet.