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Should I use Sodium or Metal Halide?

A question many people ask is... Should I use Sodium or Metal Halide lamps. The Metal Halide lights have a very balanced spectrum and are excellent for vegetative growth or leafy plants like lettuce and basil. The Halide lights produce between 65 and 115 lumens per watt which is a measure of the efficiency of the bulb, or how much light you are producing for the amount of electricity you are using.

The Sodium lights produce light that is very bright and concentrated on the yellow to red side of the color spectrum. This color is not as balanced as the Halide but makes up for the lacking of a balanced spectrum in the amount of light given off by the bulb. The Sodium bulbs produce between 97 and 150 lumens per watt which is much higher than the Halide bulbs.

The Sodium bulbs are superior in life expectancy and efficiency while the Halides are superior in spectral distribution so your decision will be based on what type of plants you are growing. The majority of growers use metal halide lamps for the growing stage and then swap to High Pressure Sodium for the flowering stage. So now you know if you should use sodium or metal halide.

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