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mini greenhouse with grow light

mini greenhouse lighting

Hello! I’m looking for some advice regarding shelf lighting. I have a mini greenhouse shelf unit that i would like to use mainly for starting seedlings (see attached picture). It’s situated on my back covered patio which gets a bit of diffuse sunlight, but is primarily shade – and a good deal darker than it looks in the photo. I’m not sure what kind of lighting setup I should use (I’d like to keep it budget-friendly). I’m okay with just using the top few shelves if necessary and keeping supplies in the bottom one. Should I place lights inside or light from the outside? Light from above or the sides? I’m brand new to growing under lights and any help is really appreciated!

Happy growing 🙂
Danielle

ab2008

This is my current setup for mine. I intend on getting 3-5 more lights to place inside it however and am considering putting some mylar inside as well. We’ll see though.

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Comments (8)

eircsmith

Thanks for sharing image of mini greenhouse.
I wish to have more information related to mini greenhouse. I am planning to have mini greenhouse.
Thanks

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danielleonfire

Not sure what information I can give you since I’ve never used one before, but it had decent reviews online (amazon) and was really easy to put together. I got mine at Lowes for a fairly reasonable price (though I had to find an associate to help me find where they were stocked).

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dowlinggram

The main thing I see with these greenhouses is the plastic doesn’t come right to the ground so cold air can just swoosh up inside. They also tip easily outside.

If you want to use lights you’d have to measure the length and get ordinary fluorescent shop lights. A 2 bulb fixture with fins on the sides to concentrate the light down is all you’d need. Of course you’d need one for each shelf.

I’d figure out some way to close in the bottom to retain the heat at night. A 100 watt bulb clipped to the bottom shelf will throw enough heat to protect your plant from freezing at night but only if it’s made air tight on the bottom

ericsmith –take a look at the “pop up cold frame”. You can set it up outside in a few minutes in the spring and it folds right up and into it’s own small bag when you don’t need it anymore. I bought one last year and I love it. It comes with stakes and has a skirt on the bottom to keep the cold and critters out

Hello! I'm looking for some advice regarding shelf lighting. I have a mini greenhouse shelf unit that i would like to use mainly for starting seedlings (see attached picture). It's situated on my back covered patio which gets a bit of diffuse sunlight, but is primarily shade – and a good deal darker…

The Problem With Using Grow Lights in Greenhouses

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When it comes to lighting a greenhouse, nothing works better than natural light. If you use your greenhouse to grow plants in winter, or if the structure or placement of your greenhouse limits the light that enters it, you may need supplemental light. Be aware that the wrong kind of light can stunt plant growth.

Not Enough Light

A common problem with greenhouse lighting is not enough light. If plants don’t get enough light, they tend to stretch, growing ever higher, seeking more light. Light-starved plants become spindly and top-heavy. Energy that could go into leaves, flowers and fruit goes into stems, and the plant weakens as a result. Getting plants enough light involves making sure the artificial bulbs have a high enough wattage. It also involves making sure the light is close enough to the plant. For seedlings especially, the light should be only 1 to 2 inches from the bulb.

Too Much Light

Plants can get too much light. During the day, plants use light and water to make starches and oxygen. At night, the plant converts those starches to sugars and stores them. One of the problems with greenhouse lighting is that it can be left on around the clock to spur fast growth, but doing so compromises the health of plants. Plants given too much light become pale, sometimes sunburned. A period of roughly eight hours of darkness each night helps plants maintain their health.

The Wrong Kind

Plants use mostly red and blue light for photosynthesis. High-pressure sodium lights put out most of their light in the yellow range, which is virtually unusable by plants. Incandescent lights put out wider range of light, but they put out heat, something that can harm small, tender plants. Metal halide and fluorescent tubes are better choices. They are cool and efficient and they put out light the plants can use.

Uneven Distribution

Uneven light means some plants will grow well while others languish. Though different plants have different light requirements, in general, greenhouse lighting should provide 20 to 40 watts of light per square foot, spread evenly across the growing surface. That light must also be able to reach all the leaves. Plants that are spaced too closely will have some leaves that are shaded all the time.

The Problem With Using Grow Lights in Greenhouses. When it comes to lighting a greenhouse, nothing works better than natural light. If you use your greenhouse to grow plants in winter, or if the structure or placement of your greenhouse limits the light that enters it, you may need supplemental light. Be aware that …