Metal Halide ... Green or Blue?

Im looking at mh lamps and i found sum but they say one is blue and one is green, which one do i get .... blue???

thank you!

actually i have no idea why i started this thread, its obviously blue..

stupid me!

nothing nothing nothing

If i brought a 150w ballast for mh and hps, then i got a mh e40 and hps e40 and a e40 screw fitting, would i be set?

THANK YOU SO MUCH!

Unbeleivable