High Pressure Sodium (HPS)

Last Updated: January 23, 2017

Definition - What does High Pressure Sodium (HPS) mean?

A high pressure sodium (HPS) light is a type of growth light that is commonly used for indoor gardening. This particular light stimulates plant growth by diffusing the portion of the electromagnetic spectrum that is ideal for the whole process of photosynthesis. High pressure sodium lights are also used to prevent the plants from growing overly spindly and long. It mimics general outdoor conditions, especially as far as color and temperature is concerned.

MaximumYield explains High Pressure Sodium (HPS)

In 1868, Andrei Famintsyn was the first botanist to adopt a high pressure sodium light for indoor gardening. This growth light is commonly favored during the reproductive and vegetative stages of gardening. In these cases, horticulturalists may want to adjust the light spectrum range to enhance growth. For example, a reddish light may trigger a more potent flowering response in different types of plants.

Unlike metal halide growth lights, high pressure sodium lights have fewer carbon emissions. They also tend to last longer. Most high pressure sodium light systems normally last between 12,000 to 24,000 hours.

A 400W bulb can easily cover a gardening area of approximately 15 square feet, while a 1000W bulb can be used on a growing area of around 7x7 feet.

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