Which color of light has the strongest spectral line?

[Brown Arrow]

hey,

i just wanted to know which line is stronger: orange, green or blue(i mean light which one has a stronger line? )

how would you know it?thanks in advance
BA
pls delete this post I am going to post in homework help. sorryi posted it the wrong section:

 

[Ryan_m_b]

What do you mean strong?