This is a 400watt Metal Halide fixture. Make sure you have a large reflector, like the one shown.
		This is a comparison of an industrial sodium light (left) and a Hydrofarm on the (right). They both work well, but I believe the grow light to have superior characteristics.
				High Pressure Sodium
		Here is a conversion bulb. This Sodium bulb was made to operate on a Metal Halide ballast.
		I found this sweet ventilation fan at the Home Depot. It works well for moving fresh air in, or sucking old air out. Wire one up like I did.
		This digital thermometer is great for monitoring the air temperature. It also, has a wire, which is submersed in nutrient to give a water reading. Just flip the switch air/water.
	Hydroponic lighting and proper ventilation are key to success.