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Good actinic lights have light right in one of the two ranges that plants use (around 420 and 450 nanmeters). But too much blue looks just awful on plants, imo.

The other range is around 650 nm -- up in the red zone.

Regular fluorescents fall right inthe middle where the human eye is most sensitive. Adding the red zone helps plants -- early fluorescent plant bulbs (made first for land gardening, then sold as aquarium bulbs) had a lot of red in them. Adding the blue zone helps plants too. Adding a lot of just one or the other has the striking effect of something missing.

Good triphosphr bulbs have a strong amount of light in both ranges or near to it, especially the 10,000 K bulbs.

Have fun,
Scott H.
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