LED is widely used in greenhouses as it is a non-pollution light source with high efficiency, long lifetime and small size and thermal radiation. Red light and blue light are efficiently absorbed by chlorophyll a and b, and spectra power distribution (SPD) of light source used in greenhouses has a great effect on the photosynthesis process and growth of plants.
Therefore, the effect of SPD and radiation of LED on the growth of plants is an important research focus.
The research group led by Yang Ki Won, a section head at the Faculty of Electronics, has manufactured a gravity injection vegetable-growing device (GI GROW) LED lamp by compounding red, green and blue using improved Gauss distribution to control the spectra power distribution (SPD) of LED.
This LED lamp consists of red, green and blue LEDs of 1W and its total output power is 1 152W, with 72 green LEDs, 864 red LEDs and 216 blue LEDs.
They have compared it with several other plans to evaluate its effectiveness. The results show that GI GROW (using this LED) could increase the fresh weight of lettuce by 1.5 times while reducing the cultivation period by 2.5 times, compared to the lettuce grown in a conventional vegetable greenhouse under the same conditions.