See if your ballast can run High Pressure Sodium Bulbs. They have the red spectrum you seem to be looking for. No MH will have that. By nature they are very much in the blue. If you get a bulb you like the visible light output from in the 4000K to 10000K, they will be fine for your plants. The popular choices these days are 5500K and 6500K. The latter less yellow, and probably your best bet.
Check GE's website, they might now
If not, there is always Retrofits