Ok soooo confused.
what is the difference between pressurized sodium, metal halide and mercury vapor bulbs? Are they interchangeable or does different fixture require a certain bulb?
For Example if I bought a fixture from company X, will it be for metal halides only or would the sodium or mercury bulbs work?
My fixture came with the bulb but I got it second hand so I don't even know what type of bulb I have. Anyway to find out? Cant read the markings.