physics question concerning light

[FinnBar]

Hi there,
I came across an interesting physics fact yesterday.
I heard that 2 amplifiers will make 4 times more sound than one,
3 amplifiers 9 times etc., always exponentially.
Apparently it's because sound waves resonate (or something, i forgot the right term) with one another.

now, i was wondering if the same principle applies to light waves? once i'll add another lighting fixture will i get four times more light?