Abstract
This research aims to study an effective way of light using for plant growth. The light types included LED, grow and natural light. Investigated periods are germination and growth. A plant nursery was 1.2x1.2x1.5 m in dimension. The structure was made of PVC tube. It was covered by black canvas. The system was controlled by microcontroller. Two sensors modules DHT22 detected both of temperature and humidity. The plant nursery was separated into two rooms for LED and grow light testing. Cooling pads and water dispenser were used for the cooling system. A fan was installed for flowing air. The plant was watered automatically. From experimental result, the plant under LED light had the fastest rate of germination. The followed by grow light and the natural light respectively. The plant under grow light is the rapidest growth. The next are LED light and natural light, respectively.
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