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how long to keep lights on?

This is a discussion on how long to keep lights on? within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; I have a Vanda under 2 t12 tubes and 2 r-b 10 watt led floods ...

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  1. #1
    MICKEY's Avatar
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    Question how long to keep lights on?

    I have a Vanda under 2 t12 tubes and 2 r-b 10 watt led floods
    I keep them on 15 hours but I have been reading a older Orchid care book and it says if I keep the lights on more than 12 hours it will not bloom
    is this info out dated , how long should they be on

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    ksriramkumar is offline Senior Member
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    I don't grow under lights but I think you should mimic what is in natural conditions. I feel 15 hours to be high. I think we should have 12 hours in summer and 8 hours in winter. many of plants respond to reduction in day light to initiate spikes and 15 hours of constant light could affect that. I could be totally wrong

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    It depends on the lights you're using. I use fluorescent lights for some of my plants, and I usually have it on ~14 hours during the summer, and ~12 hours during Winter. Some plants are really sensitive so it's good to gradually decrease the times during fall to best fit their needs.

  4. #4
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    I keep my fluorescent lights on 14 hours all year long, i dont grow vandas. I grow paphs, phals, dens, and onc. This way and have had no problems for many years. Id say 15hrs is probably fine in summer, but you may want to cut it back to 12 or so in winter. Id say 15 hrs is on the high side for light users most of us leave our lights on for 12-14 hours.

    ---------- Post Merged at 10:42 PM ----------

    I keep my fluorescent lights on 14 hours all year long, i dont grow vandas. I grow paphs, phals, dens, and onc. This way and have had no problems for many years. Id say 15hrs is probably fine in summer, but you may want to cut it back to 12 or so in winter. Id say 15 hrs is on the high side for light users most of us leave our lights on for 12-14 hours.

  5. #5
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    I leave them on for a bit longer. I am mostly under fluorescent lights.

    I am on for 16 hrs a day summer and 14 winter. And the 14 hrs winter is partly so I can be home for some time and be able to see them and work on them easier. Otherwise, I'd only have 1 hour of lights on when I get home from work.

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    why don't you just have them go on latter and then off latter with the same amount of hours 78

  7. #7
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    I get up at 4 am leave for work at 5 am. Get home by 5 pm.

    I like them lit when I do my morning watering (mostly mounted) and on when I am working on them.

    I am not unhappy with my length of lighting. I have good results.

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    I had them on for 15 hours and just changed them to 12 hours but the get some low light from the window in the morning before the lights go on

  9. #9
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    I left mine on for 24 hours a day for months, didn't seem to hurt anything. I don't know if it affected flowering or not though, I do have some mature Phals that don't flower often. Mostly now I turn them on when I get up to see my husband off to work (about 6:30 am) and off when I go to bed about midnightish. I just go by whatever is convenient for me.

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    I use a timer so I don't forget and so it is the same everyday

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