So I'm working on building my Senior Project for Undergraduate Electrical Engineering and we're having a problem with light sensors. The robot will display emergent behavior and we specified that when a loud noise is heard the robot would run to the darkest area it can find(without using mapping). We're looking for a sensor to find the dark areas of a room but can't find one that works very well. I have tried a photocell but we're looking for something that is more directional where as the photocell just detects what is on the sensor. does anyone have any ideas on how to detect light from a distance or detect directional light if its possible?