HPS emitting dull white light instead of orange light. WHATS GOING ON!!!!!

ive been growing for numerous years and have gone through my fair share of bulbs but have never seen this. Im running a lumatek 600w hps in a lumatek digital ballast. I go out there the other day and my the light looks like its coming from an MH bulb, its just white white. so im wondering if anyone has run into this before. you guys think its my ballast or my bulb. i havnt tried switching out the bulb yet to see if its the ballast, but i will soon just seeing if anyone knows whats up.

Sounds fucked.

lumatek bulbs are dual spectrum i think.
They emit both MH and HPS i beleive and may look more MH.
i assume u mean it all the sudden changed? are u running the super lumens straight outa the box?