How does artificial light affect flower opening and closure?

Good question, tough to answer. Plants generally follow two strategies for flowering. First is day length whether natural or on a timer. The increasing or decreasing light triggers blooming, sometimes twice as day length is the same spring and fall. Even clouds can cause some flowers to open or close if they are day-night bloomers.The second is light color or spectrum determined by the amount of atmosphere sunlight must pass through or bulbs specially made in various spectrum's. The more atmosphere light travels through in the fall causes it to redden, in the spring the color is bluer. Bluer bulbs usually promote leaf growth, red spectrum bulbs induce flowering. If I've totally confused you feel free to e-me. RScott

How does artificial light affect flower opening and closure?
It depends a lot on the type of plant. Some flowers open and close outside with sunlight, and stay closed on a cloudy day. It depends on the type of light you have inside just what the flowers will do.

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