I want to get an arduino board that is interfaced with a photodiode?
I want it to generate a data output of intensity with respect to time on a SD card .
I have searched the web, but didn't find it. I would prefer to have the arduino board programmed in advance.
Photodiodes are very low level devices that require amplification before being useful as a analog input for an arduino. See if any of the example circuits in the below document might be appropriate to what you wish to do.