Study on LED growth light to improve the quality of lettuce and help in plants growth

Foo, Wei Hong (2018) Study on LED growth light to improve the quality of lettuce and help in plants growth. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

LEDs play an important role in the indoor planting. LEDs light emits the light which is similar to the sunlight which is important for the crops. However, there is various type of LEDs different in wavelength, colors, and brand will affect the plant growth. The main problem for this project is to determine the ratio between red to blue and the layouts of the LED which is best combination for the plant lettuce. For this project, a wavelength of red LEDs 660nm is used and 430nm is for the blue LEDs. Since the different ratio of red to blue LEDs will bring in different results, a literature review needs to study to avoid testing on some ratio that did not bring any impact to lettuce that done by other researchers. The ratio of 10:1, R1 and 5:1, R2 red to blue LEDs will be tested to make a comparison to determine which ratio will bring the biggest impact to lettuce. Those two type of ratio is done by the researchers and it achieves the best result while comparing with other ratios. Besides the ratio of red to blue LEDs, the layout of the LED also play an important role in the plant growth. There will be two type of layout which is an RRRBRRRBRRRB arrangement of LED, L1 and RBRBRBRB arrangement of LED, L2. After determine and design the ratio and the layout of LEDs, the combination of ratio and layout, R1L1, R1L2, R2L1 and R2L2 will be experiment to determine which combination will bring the biggest impact to the lettuce. The lettuce will be observed and measured in the dry weight and color to determine which is the best combination of LED for lettuce. The combination of R2L1 has achieved the desired result for the growth of the lettuce. Hence, the objectives of this project has been achieved.

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