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Growing under lights

This is a discussion on Growing under lights within the General Orchid Culture forums, part of the Orchid Culture category; Hello I have an east facing room with little natural light 8ft x 11ft I ...

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    Default Growing under lights

    Hello I have an east facing room with little natural light 8ft x 11ft I have just had installed ten growlights equally spaced in the ceiling, I have a few Cattleyas in there, they are about five foot from the lights, is this too close? or not close enough to make a difference? when the lights are on the leaves take on a pink colour, would appreciate any advice on the lighting and wether this is the right enviroment for the Cattleyas Many Thanks

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    Five feet is an unusually great distance between plants and lights, but like most parameters in orchid-growing, it depends.

    • What type of lamps are they? Fluorescent, CFL, LED, etc.?
    • What are the true wattages of each of the lamps?
    • How many individual lamps? That is, does one of your many lamps have a single bulb, or is it two per lamp, or more?

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    Hi

    Thanks for replying the lights are LED grow lights I have ten individual lights equally spaced in two rows set in the ceiling, the wavelength is Red 660nm and Blue 445nm wattage 10W lumens 100LM, I have tried to research what I would need and how to position the plants but to be honest I am finding it very complicated, I am a bit wary of raising the plants in case the foilage gets damaged but also want to give the plants what they need, I would really appreciate any advice you could give thanks

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    No clue but I am sure Ray will help you. My light is natural and I am glad of it!

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    I am in the process of changing all of my lighting to LED and would love to hear some opinions on this.

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    Yes I look on enviously at the conditions some of you have to grow your lovely plants

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    Based upon that, I suspect the lamps are far too far from the plants.

    When I had a 3' x 6' "seedling nursery" set up in my basement, I used two 23-watt Philips Greenpower Deep Red/Blue strips, and they were no more than 12" from the plants.

    So using a VERY rough "guesstimate", I had 48/18=2.56 watts/square foot, versus your 100/88=1.14 watts/square foot, or 45% of mine, and as your lamps are 5 times the distance, the intensity is 1/25 of what I had, at best, so combined, you're at about 1/50th of the overall intensity my plants received.

    Personally, I'd move those lamps to about 12"=18" from the plants.

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    O.K. Ray Thats very helpful I will do that today thank you so much for your advice, I had read all I could find online and was very confused you have really clarified it for me thanks

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    To begin with, I want to let you know that I'm not an English speaker, I'm using Google Translate, so you have to make an abstraction of the grammatical form.
    I grow orchids in terrariums and found that the spectrum of light used has a great influence on plants so I tried to look for another light source as an alternative to T5 HO these being quite expensive (in the sense that a T5 HO with a good spectrum). ...there is much to say ...
    I started to use LED light five years ago, initially I bought but the light emitted was quite disturbing to the human eye, after scandals with my wife I started to build myself these lights and gained little experience. We also found that the difference between the T5 HO and the LED is high, with the T5 HO consuming about 250W from the power grid and now with LED is 80W, the results being better in the case of plant growth.
    An enthusiastic grower of orchids that grows plants in the house wants the well-developed plants making many flowers, at the same time the light generated by the grow light does not have to be disturbing. The spectrum used by you falls exactly on the negative side of what I said, that is, 445nm and 660nm is anemic to a beautiful orchid and too disturbing to the human eye.

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    That is very interesting I did worry about the light as it seemed to me to be quite strong the whole room is glowing pink!, I also intend to use a terrarium as I have an unused one, once I have a clearer idea of what I am doing Thank you very much for taking the trouble to use Google translate

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