=Which Color is Brightest: Red, Green, or Blue Light?

[rycw]

which colour is brightest (red monochromatic light, green monochromatic light and blue monochromatic light )? and which light will give highest radiant flux? why?
Thank you

 

[jtbell]

This is like asking, "which sound is loudest: bass, treble, or midrange?"

In other words, you need more information!

 

[Rajini]

If you know the wave length of each light you can try to find its frequency...
As jtbell said: it is somewhat difficult to say with less information that you gave.
But brightness is something related to convergence angle, bandwidth, etc..i.e. it mainly depends on collimation.

 

[GRB 080319B]

http://hypertextbook.com/facts/2007/SusanZhao.shtml" : "The eye is most sensitive to green light (555 nm) because green stimulates two of the three kinds of cones, L and M, almost equally."

So green light would be perceived as "brighter" by the human visual system.