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  • 1 Post By raybark

light brightness and length

This is a discussion on light brightness and length within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; In discussing light requirements of the different types of orchids I find that some need ...

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  1. #1
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    Default light brightness and length

    In discussing light requirements of the different types of orchids I find that some need stronger light. I'm not seeing length of light requirements. Is the length of time that the orchid gets bright light as important as the brightness of the lights? I read that if you want an Oncidium to flower it needs bright light. But how long every day should it get the bright light?

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    By stronger light people mean how many foot candles or lumen plant need, sometimes light intensity also expressed as Lux (there is equation between them).
    You can often see they say phals need about 1000-1500 foot candles. Cattleyas if i remember correctly 2000-3000. And vandas more than 3000.

    Alsobis your question about natural light or artificial?
    For artificial they say it should be on for 10-12 hours, even 14 to imitate summer time.

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    First we have to recognize that plant lighting is a matter of allowing it to absorb the right amount of light - literally, the number of photons.

    If you look at the light level recommendations published in books, AOS culture sheets, and the like, the numbers are the maximum levels. Some folks think that THAT is the amount of light they should get all day, but that's overdoing it.

    If you take a very rough approximation of natural sunlight from dawn until dusk as a triangle, then the area under that triangle - the light intensity x the duration - is 1/2 base x height. So, if you have a plant that can endure 3000 lumens on an average day (14 hours?), the artificial light level required - because it is constant, and not increasing then decreasing like the sun - would be 1500 lumens for the same 14 hours, or 1500 x 14/12 = 1750 lumens for 12 hours, 1500 x 14/10 = 2100 for 10 hours, etc.

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  4. #4
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    when I grew under lights, I adjusted the light period to match day length outside...so as days got shorter, my light period was shorter, and vice-versa. This let the light period mimic the season, so plants were cued to bloom at the right time. It worked well, as long as plants had enough light during the day period...a few just refused to bloom until they got stronger light.

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    I have my artificial lights on about 16 hrs a day during the summer and about 14 hrs during the winter.

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    probably depends on where there from tropical plants from near the equator will get around 12 hours of light a day , plants from the arctic will get 24 of light during the summer and 0 in the winter

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