How do you calculate the amount of light?
>if you have two pipes spewing water at 10 l/min each, and you open the second pipe you have doubled the flow
>if you have two shuttered windows, open one, and then open the second you have NOT doubled how lit up the room is
>if you have two pipes spewing water at 10 l/min each, and you open the second pipe you have doubled the flow
>if you have two shuttered windows, open one, and then open the second you have NOT doubled how lit up the room is
