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OPT3001: day light sensor

Part Number: OPT3001

hii ' i need your help 

in my application i want to use your opt3001 to till the difference between day and light i am not interested by accurately measuring  the intensity although the sensors give me this option  i just want to give my application a feedback that day turn into night how can i do that using your sensor ?

what are the threshold of lux of day turn into night ? and is the sensor effected by lighting of surrounding buildings and street light