Will any mh be the same

I JUST got a Osram Powerstar 400w HQI-BT/D (Daylight) Metal Halide Lamp it was half the price of a philips 400w is there a big difference

If its just a MH and not a enhanced spectrum MH then its the same. Osram is a good company. I was very happy with my Osram Plantastar HPS bulbs and they were cheaper too!