As the above comment states, you're fucking up your bulb and ballast.
If you can't move the plants, just bring in a 6500k cfl or an led flashlight or something, if it's really hard with the color from the hps, but I think most people using hps can kinda just tell what the differences are in color. I know when I'm at friend's houses checking out their plants I can tell the difference between purple and green, and green and light green, and red, and pale and burnt under hps, in agreement with xswimtothemoon.
of course you wouldn't have this problem if you'd been using a better grow light from the start. go CMH! "White" power!
The green light I don't really see helping you, if you can't see under an orange/yellow light why would a green one be any better?