At University of Tennessee ant Chatanoga the stadium lights area MH. But on one of the poles with many lights one bulb was a HPS bulb while all the others were MH. How can this be?

possibly a conversion bulb designed to run on s metal halide ballast.

but why? it looks weird when all the lights are white and one is orange

And is this not a defective MH bulb with an excess sodium/lack of other halide fill? Or overpowered (250W bulb used on 400W ballast)? Some MH chemistries use saturated vapor concept, so the component ratio strongly depend on the temperature. And the sodium has the steepest curve...