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Virtual reconstruction of the glasshouse with 60 tomato plants. Three high-pressure sodium (HPS) lamps were located near the top of the glasshouse. The spectrum of the lamps only contained a small amount of blue and green photons and a large amount of red and yellow photons, causing the visual orange colour of the leaves. The starting position of each plant stem can be seen as the internodes that protrude from the rockwool blocks.
