Abstract
We investigated the effects on plant growth of a mercury-free lamp with high CRI, operated on inductive ballast. This lamp has a spectral power distribution in the 600 to 780-nm region, higher than that of conventional lamps. Since this lamp is free of mercury, it is less harmful to the environment than lamps that contain mercury; therefore, we believed that this type of lamp would be useful in plant factories. We examined the effects of the mercury-free lamp on the growth characteristics of sunflower and lettuce plants, and compared them to plants grown under conventional lamps. We concluded that the mercury-free lamp advanced plant growth, increased leaf area, and inhibited leaf number compared to the conventional lamp, making it attractive for large-scale use in plant factories.
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