Y. P. Sihotang, I. Indriyani, and D. Fortuna, “The Effect of Light Emitting Diode (LED) White and Blue Spectrum on The Characteristics of Lettuce Grown in The Deep Flow Hydroponic: Deep Flow Hydroponic of Lactuca”, Jur. Bio-Geo. Mat. E, vol. 3, no. 2, pp. 81-90, Sep. 2023.