This photo diode looks like it might be good for a DIY meter thoughts
http://sales.hamamatsu.com/assets/pd.../S1087_etc.pdf
This photo diode looks like it might be good for a DIY meter thoughts
http://sales.hamamatsu.com/assets/pd.../S1087_etc.pdf
You'd have a hell of a job calibrating that for each wavelength.
Take a look here : CLICK!
They've succesfully created a DIY thermopile meter that can be built very cheap
sorry i cant read that, im a snobby American who only knows one language