A metal halide light bulb is used by many gardener for indoor gardens because it allows the best plants to grow in the most reliable, controlled and efficient way there is.
This is not to say that metal halide lighting suits every plant on every situation. It is ideal for young plants because of its white light. This is exactly what these young plants need to mature quickly and stay in its maturing longer. This is really the most effective lamp for indoor garden.
The metal halide light bulb needs a ballast to function, of course. Ballast is the auxiliary power supply. Make sure that you use the right ballast for the amount of light you require. The metal halide light bulbs require high voltage to start. When the arc, the internal vapor pressure increases until it reaches the required value. The light intensity becomes stronger and stronger until it reaches its maximum.
If you want to use metal halide to grow plants, keep the following in mind:
Make sure you know the temperature that your plants need
Get a ballast/fixture that is rated for the temperature of lights that you use
Make sure you have ample cooling fans to avoid making the place too hot
There are certain ingredients that you can use to further make sure that it will be suitable for plant growth. There are types of compact metal halide lamps that is ideal for movie and slide projection. Indium is usually used because it emits small, intense high-brightness arc.
Happy planting.
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