Effects of Light from LED Bulb on Growth and Yield of Red Oak and Green Oak Lettuce in Hydroponics

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Penkhae Rungrueng
Namfon Suwan
Soontreeya Kalawong
Chutima Kapkaeo


The effects of a light-emitting diode (LED) on the growth and yield of red oak and green oak lettuce in hydroponics systems were investigated in a temperature-controlled room at 25±2 oC for 16 hours a day, and the results were compared with outdoor cultivation. The experiment was organized in 5x2 factorial design in a completely randomized design (CRD), with factor A consisting of five types of LED lights: white LEDs, LED grow light (4000 K), grow light (warm white), grow light (pink), and sunlight (control). Factor B included lettuce types: red oak and green oak. The plants were harvested 35 days after planting the seeds. The results revealed that both the LED light and lettuce type significantly influenced plant height, leaf length, leaf width, color (L*, b*), and shoot fresh weight (P≤0.01). The LED grow light provided the number of leaves, the height of the plant, the width bush, the length leaf, and the width of the leaf better than sunlight. However, concerning yield, plants grown under the sunlight exhibited significantly higher fresh leaf and root weight, as well as dry leaf and root weights, compared to those grown under LED light. Regarding lettuce types, there were significant differences, with green oak exhibiting higher growth than red oak. It was observed that general white LED bulbs were not favorable to the growth of both red oak and green oak lettuce.

Article Details

Biological Sciences


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