Light Activated "Off" Switch, Or dark activated "On" switch

[mynamehere93]

Okay, this seems like a relatively simple task...
I need to make/get approximately 30 switches that require no power, and connect to ground when there is no light shining on them. Meaning that when there is a light on them, they are not grounded.

And Also, the light being used is a powerful green laser, so which appropriate components/filters would i need to keeping the switches functional after hours upon hours of constant lasering

 

[Externet]

What is the current these switches will conduct to ground when dark ?

What is the voltage needed to be as not-ground when the laser hits the target ?

A solar cell with a green-pass filter lens could be the base of the simple circuit.

 

[mynamehere93]

ill have to test the connections, as i have no idea to the voltage/current needed, but to put it in perspective, its making the connection of an electronic keyboard keypush, so its not going to be super extreme...