Narrow spectrum lights are noted for serious gardeners and plant nerds who need to support different stages of development. Blue-light spectrum (450-490 nm) grow lights are used for early-stage growth ...

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We may earn a commission from links on this page. Deal pricing and availability subject to change after time of publication. In just a few months, we'll be starting seeds for the spring garden season.

There is a general rule of thumb that we use in the greenhouse for lighting plants. It states that for every 1 per cent reduction in light there is a 1 per cent reduction in plant growth. And whether ...