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Multi-chip light-emitting diodes (LEDs) (A) have three chips (two red chips and one blue chip) to satisfy the spectrum demand of the lettuce; each chip’s rated power is 3 W. Combined with the convex lens (B), they form the multi–chip LED – convex lens unit (LCU, C), hanging 30 cm over the top of the cultivation boards to accumulate the photosynthetic quantum as much as possible to irradiate the Fresnel lens (D), which focuses the photosynthetic quantum again to illuminate the plants.
