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The BPW34 is a very common photodiode. It has a wide spectral response and can be used as a light sensor.   
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The BPW34 is a very common photodiode. It has a wide spectral response (visible and near infrared)and very high speed.   
       
'''Spec Sheet:''' http://www.vishay.com/docs/81521/bpw34.pdf
 
'''Spec Sheet:''' http://www.vishay.com/docs/81521/bpw34.pdf
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''Voltage In:'' 3.8 V ~ 30 V
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''Spectral Bandwidth:'' 430nm to 1100nm
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''Supply Current:'' 6mA
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''Highlights:'' It is an ideal replacement for photocells however it is a current device and requires an amplifier circuit as the one shown below to function properly. Also it's reponse is much faster than that of a photocell (100ns compared to 10ms).
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