Homebrew PCBs

At 02:19 AM 10/17/2005, Leon wrote:
> >>Why do you need a laser? A UV LED with a collimating lens should be
> >>sufficient. You don't need coherent light, and the only advantage then to
> >>a
> >>laser is the smaller beam divergence initially.
>
>UV LEDs don't have anything like enough power.

What's the power requirement to expose a photosensitive board?

Remember a 5000 millicandela LED will focused down to a 0.0254 mm point.