My recollection from old posts is that 16 hrs a day is the max one
should expose the plants to, and most folks did that in the summer
only, backing it off to 14 in the winter.

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Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!
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"wendy7" wrote in message
news:xKHBd.8563$yW5.4967@fed1read02...
Happy New Year to you too Xi,
I have never grown anything under lights but my
guess would be to simulate nature as close as possible?

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Cheers Wendy

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Xi Wang wrote:
Just curious, and perhaps I've missed this in past posts, but if
one
grows orchids with artificial lighting, can this light be sustained
day and night (or the majority of a 24 hour period anyway), or do
plants have some sort of circadian rhythm that needs to be
maintained, i.e. needs period of darkness for proper growth?

Cheers and happy new year,
Xi