Browsing in my local lighting/electrical dist. center today and found a rather different halide lamp, there was only two of this type in the "clearance" section for only $7 each. The store associate knew nothing abou the lamps except they were special ordered for a customer who returned them the next day. They were bubble-wrap (no box or any mfg./brand info), the lamps are tubular shaped (very rare here in US, almost everything is ED or BT shape). The etch near the base only reads "175w MHQ-D" no other info. The arc tube is also much larger than a typical 175w arc tube, in fact its even larger than most of my 250w halide lamps. On a 175w CWA ballast it appears around 5000K color temp and about the same lumen output of a typical 175w daylight halide lamp even considering the huge arc tube. The base insulator is ceramic so it was more than likely made in china. Anybody know who makes this lamp? Pic below

also forgot to mention this lamp goes through the strangest warm up, it starts a dim purple color with a bright pink discharge around the electrodes, then warms up to a bright green (like a thallium green, not mercury green) and stays that color for almost 3 minutes, then shifts to the white 5000K. Ive got a feeling its a european lamp, the halide salt color in the arc tube is also much different when the lamp is off compared to our usual sodium scandium lamps. Plus the unusually big arc tube

Your lamp is a "Daylight rare-earth metal halide" lamp. It have thallium, dysprosium, holmium and thulium. Very similar to the european pulse start Osram HQI-T/BT 400W/D, which exhibits this green color as well, before turning daylight.
The pink glow is suspecting, because the argon don't tends to appear during ignition. And if the lamp haven't any sodium. Probably it have an argon-neon gasfilling (If the initial colors was toward the red color).

Lamp is made by VENTURE