ok i finally finish him put it's normal that I have dificulty to see the beam in dark ? my 5mw 532nm is 2x more easy to see it :S but he can burn mach, pop ballon et burn cd case :S
check out this graph. Wavelength is on the X-axis, eye's sensitivity to it is on the Y-axis. Your red is ~660nm, your green is 532nm. You can see on the curve marked "color" that your eye is much more sensitive to green than the red.
The way I interpret this is that if I see a 5mW 532nm laser and a 5mW 660nm laser, the green would appear about 16x brighter.