The grow light in an NFT (Nutrient Film Technique) hydroponics system provides the necessary energy for photosynthesis, which is the process by which plants convert light energy into chemical energy. Photosynthesis is essential for plant growth and development, as it allows plants to produce the carbohydrates, proteins, and other molecules they need to survive.
In an NFT system, the plants are grown in an inert growing medium and their roots are suspended in a thin film of nutrient solution. Because the plants are not anchored in soil, they do not have access to natural light. Therefore, a grow light is required to provide the light energy needed for photosynthesis.
Grow lights are typically high-intensity lamps that emit light in the visible and ultraviolet spectrum. They come in different types such as LED, HPS and MH lamps, which can be adjusted to provide different levels of light depending on the stage of growth of the plants. The grow light is usually placed above the plants, and a timer is used to control the length of time the light is on each day.
To sum up, the function of a grow light in an NFT hydroponics system is to provide the light energy necessary for the plants to carry out photosynthesis, which is essential for their growth and survival.