They are used for growing plants.
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Lights can grow plants.
They don't. Plants need the light, sunlight, to get photosynthesis to grow and not die.
sunlight mostly
Lights can grow plants.
Yes, high pressure sodium lights will help to grow plants indoors. You can grow tomatos and other plants that need normally need sunlight.
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A regular lamp will not produce healthy plants. "Grow lights" or fish tank lights work best as they provide the required light colors for plant growth and health.
LED grow lights are primarily used in the process of producing plants. It was thought to be one of the best methods available for growing plants before the onset of hydroponics.
Hydroponic lights are used to in the practice of growing plants indoors. They are used in hydroponics to simulate the sun so that the plants can grow as if they were planted outdoors.
You need grow lights which are in another light spectrum. Regular lights won't do as well to help your plants.