A grow lamp mimics outdoor sunlight, enabling you to grow your plants indoors while imitating outdoor growing conditions. An HID light is called a high intensity discharge light, and it offers several advantages over standard halogen light bulbs to the benefit of indoor gardening.
The first improvement you will notice is that an HID lamp produces a greater amount of light than a halogen lamp. This is an important feature if you are trying to grow vegetables successfully indoors. As any gardener will tell you, many popular vegetables, such as tomatoes, require a lot of light and properly warm temperatures to grow and mature to perfection. You can grow tomatoes indoors with HID lamps, because the produce enough light. HID lamps also require a lamp ballast in order to function properly. The ballast is used to start and then continue the arc of light within the bulb. The bulb contains gas and metals, and the gas helps to start the light, and once the bulb is warmed up, the metals produce the light.
In these times of energy conservation, it is important to think about how much power your grow lights will use. The HID light uses less power than standard halogen bulbs, so you will be able to grow your plants indoors and save money at the same time.
Another advantage of HID lamps is that they produce a whiter-colored light that is similar to the color of natural daylight. The light from halogen bulbs appears more yellow in tone. This is important if you are trying to create outdoor growing conditions in an indoor environment, because the white light is closer to natural sunlight, and your plants will appreciate that.
The last benefit of HID lights is that they last longer than halogen bulbs. This means you will spend less time buying and changing out bulbs, and more time on the fun of gardening.

