Don't buy components and try to assemble them yourself. A reflective hood will help you get the most out of your lighting. It will reflect light that would otherwise be lost to the sides and upwards and concentrates its effectiveness by focusing light on your plants. There are a variety of shapes available. A vertical bulb throws most of the light out sideways so it must bounce off a reflector before getting to your plants.
Most people feel horizontal systems are more efficient and provide greater light intensity.
The reflector should be lightweight and painted white to ensure it will reflect most of the light back. Some of the newer reflectors with specular aluminium or brilliant chrome inside are proving to be even more effective. Some reflectors allow you to exhaust hot air from around the bulb making it easier to control the temperature in the room. Water-cooled lights are also useful if you have easy access to cool water or a chiller as they allow the plants to be placed much closer to the lights. The distance between the lights and your plants Naturally the closer your plants are to your light source the greater the intensity of light they will receive.