Lighting an orchid closet - fluorescent or LED? Otherwise?

[Ray]

Naoki (and anyone else interested), take a look at sevengens.com. It is a website for LED horticulture.

I have been communicating with Don, the owner, and they are finding that plants respond differently to individual wavelengths in some cases, which may lead to a greater productivity.

So far, the majority of their work is with berries and vegetables, but they are developing emitters and controllers that allow one to vary the spectrum to suit your needs.

Interesting stuff.

[Ray]

Following Rob's speculation about understory plants - I don't know if they 1) need fewer photos, or 2) are more efficient at grabbing them, but I would think that they might have evolved to a slightly different spectrum. Light filtered through overhead vegetation certainly will be of lower intensity, but its spectrum ought to have shifted from reflection off of it.