You see, the difference is obvious.
So you´re hooked, I guess
One more tipp: Being patient and check back often, you can aquire metal halide lamps and bulbs at ebay for cheap. Typically what you have goes for 30-40$ but I also have aquired several lamps for less than 10$ or a dozen 70 W HCI bulbs for as low as 10$.

Good luck

Ingo