Decide what length of electrical cord and air tubing you want. Cut to appropriate length.
Wire the male plug onto the end of your cord.
Open the housing [A] of the vapor fixture. You should find two screws near the light socket on the upper part of the fixture. You will find the upper part (cap) and the base on which the light socket is mounted. Drill a hole in the base, through which you will run the air tube.
Screw the strain relief [B] to the cap, where you will find a threaded opening at the top.
Run both the air tube [C] and the electrical cord through the strain relief. Tie the electrical cord in a simple box knot -- this will ensure that no strain is placed directly on the connection between the socket leads and cable when the lamp is hung.
Strip the ends of the wires back and connect to the leads with wire nuts.
Feed the air tube through the new hole, again, leaving about 8 inches below the base.
Screw the base back to the cap. When doing this, you should ground the fixture by taking the green ground lead and twisting it around one of the screws that connects the cap to the base.
When you have reconnected the cap to the base, gently tighten down the strain relief via the nut on the strain relief. Don't tighten too much or you will squeeze the air tube.
Screw the bulb of your choice into the socket.
Fill the glass globe [D] about one-third full with mineral oil. Remember that the light bulb will displace the mineral oil, so you don't want too much. Even though the rubber seals work fairly well, if you overfill, a little mineral oil will seep out. For this reason, when you have the whole assembly completed, you want to keep the fixture upright and not on its side.
Screw the globe to the base, and then the aluminum grill [E].
Attach the air tube to the pump [F], plug the pump and the light in and, presto: bubble light!
You can hang it anywhere -- a reflective surface such as a white wall picks up the reflections nicely. To hang, we generally use a quarter-inch eye bolt mounted in the ceiling with a toggler, though of course the method of hanging depends on what you plan to hang it from.
If you choose, you can put a switch or dimmer in line for the light. Do not put a dimmer on the air pump line, as this will burn out the pump.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.