Effects of LED Lighting on Seedling Production with Multilayer Float System of Flue-cured Tobacco

The effects of light emitting diode (LED) lighting on seedling quality and energy cost in multilayer float system of flue-cured tobacco were studied. The results showed that the seedling stem height, stem diameter, leaf number, fresh weight, chlorophyll content, and root activity increased with the increase of LED lights. The cost of power consumption increased significantly with the increase of LED lights. Compared with the control (24 full spectrum fluorescent lights), each 7.6 m² area of multilayer floating system needed 30 to 40 LED tubes (each LED tube containing 144 LED lights), and the cost of power consumption reduced by 46.8% to 60.2%.