D200-D300 Wireless Remote
When doing lightning I setup up on a tripod in a dark area and set my camera for a 30 second exposure at f16 or f22. My f-stop depends on the intensity of the lighting. I'll adjust my f-stop after my first exposure. While my shutter is open for 30 seconds or longer I may get several lightning exposures. You can also use bulb but the 30 seconds works for me. I also block any stray lights by holding a cardboard in front of the lens, being careful not to touch it. I remove the cardboard when a series of lightning flashes starts or you can leave the sensor uncovered if no stray lights are around. You will have several blank shots when there is no activity but you will have keepers when the fireworks begin.
Caution:Make sure you are in a safe location away from the lightning and rain.
Thanks arhphoto for your advice.