Homebrew PCBs

On 26/01/2012 15:01, Rich Osman wrote:
> Spectrum should be pretty easy with diffraction through a prism. It
> doesn't seem that you need enormous accuracy or precision.
>
> My concern is measuring power with some degree of accuracy to predict
> exposure times.


Just use a test strip as used to be done with photographic enlargers.

Leon
-- 
Leon Heller
G1HSM