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11 votes

How much lighting do I need for growing lettuce using indoor hydroponics?

The reason you are not finding the answer you are looking for in regards to the lumen requirements of crops is that lumens is a measurement for humans. It is based on the level of light that we can ...
11 votes
Accepted

What LED light should I choose for a specific PAR watt need?

My summary of the various information sources would go something like: Light outside the range 400 to 700 nm is less useful. As all the light shown below is in the 400-700 range you are not spoilt ...
10 votes
Accepted

What is 'Etiolation'?

Etiolation is long, spindly growth caused by poor lighting conditions. Plants will tend to be more yellowish because of chlorophyll lack. You will see it at its worst when trying to greenhouse start ...
  • 3,883
9 votes

Can I cut the top off a drooping aloe plant?

The damaged leaves will not heal, and the weakened narrow portion of stem will remain that way. It can grow from the end, though, and that can be healthy. It was obviously suffering from etiolation. I ...
  • 51.5k
8 votes

Are household LED bulbs suitable as supplemental light for plants?

There is very little good information about the actual wavelength spectra and intensity for household LED bulbs and they may differ by model/brand and color temperature (ie. 3000K vs 5000K) to some ...
  • 81
8 votes

How much lighting do I need for growing lettuce using indoor hydroponics?

I have had excellent indoor results with two T5 fluorescent tubes per 8 heads. The most important thing about the lights is that you must get 6400 Kelvin (+/- 300) wavelength lights. They are not the ...
  • 181
8 votes

Can plants have too much light, or do they need night/rest?

Actually.. Here's a study that shows tomatoes do pretty well in a 24 hour continuous, but they varied the temperature and they didn't get the spotting that had occurred with 24h lighting in the past. ...
  • 81
8 votes

Why is my apple seedling shriveling up after like 15 min, every time I remove the plastic dome?

Try removing the bag a little at a time over the period of several days so the seedling can acclimate to the unprotected environment. It's going to be just like hardening off any plant.
  • 6,326
8 votes

Solar driven LEDs to offset electricity for mass growing in a basement

The cost effective solution for quite some time is and has been and probably will be to move further "towards the equator" and ship "away from the equator", or for a few things that don't ship well ...
  • 19.3k
8 votes
Accepted

Why are my aloe leaves turning white and brown?

First, here is what sunburn looks like on an aloe leaf: And here is what etiolation looks like on an aloe (this one's actually mine :o): Mine is etiolated because it's in the basement under ...
  • 51.5k
7 votes
Accepted

Will this 20,000k LED bulb function as a grow light?

A 20,000°K lamp will have peak output at 145 nanometers (Wien's Displacement Law). That's hard ultraviolet. It will hurt your plants. 10,000°K still peaks at 290nm, UV. You want a lamp with a far ...
6 votes

What are the alternatives to AeroGarden

I've built my own aero tank from an Ikea storage box and a 24V pond fogger. I started with these instructions and made a few tweaks and refinements over time, and the thing works quite well. Since ...
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6 votes
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Is total darkness acceptable for tomatoes to recover from transplant shock?

You can do that, but not for more than a couple days, before giving them light again. You don't want to see any signs of etiolation, or you will have to 'harden off' the plants back into light. If you ...
  • 51.5k
6 votes
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Is sunlight from my window enough to grow cherry tomato seedlings indoors?

Seeds don't need light to germinate, they just need moisture and heat. But they need light to grow. Fruiting plants need the most light of all edible plants as the energy from sunlight is needed to ...
5 votes
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How will indirect sunlight affect indoor tomatoes under grow lights?

You can't go wrong with extra light but the real problem is that the plants will grow towards the light. If you are able to turn the grow area once a week or so then yes, take advantage of the natural ...
  • 56.5k
5 votes
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Tropical Growth Room for Vanilla Planfolia

The environment you describe sounds quite challenging for most plants. You might find some of these points to be relevant to the design of your enclosure: plants do not need any terrestrial soil to ...
  • 56.5k
5 votes

Can plants have too much light, or do they need night/rest?

You need to distinguish between vegging and flowering when it comes to light cycles! Vegging light cycle can be 18-24 hours under MH (Metal Halide with a good Daylight Spectrum Bulb) or fluorescent ...
  • 51
5 votes
Accepted

Does a luxmeter provide an accurate measurement of usable light?

Yes, low end (less than $100 US) lux meters will work for most measurements, and is a useful tool. Deep shade (too low for the average plant to thrive) is about 1,000 lux. Normal house lighting is ...
  • 51.5k
5 votes

Will this 20,000k LED bulb function as a grow light?

"Cool White (6000-6500k) Warm White (3000-3500K) Natural White (4000-5000k)" This is the section you should be looking at for a grow light. The best light range for indoor growing is between 2700k ...
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5 votes
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Can strawberries be grown year-round indoors?

I think this link might be insightful. Basically, it says they need six hours of sun per day (or artificial plant lighting). I imagine that should be good for fruit as long as it gets enough red ...
5 votes
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Is a skylight enough light for tomato seedlings?

It's too early to start them off where you are - wait till earliest mid March through to mid April. If you start them now, even if they grow sufficiently well, which isn't likely because light levels ...
  • 130k
5 votes

What fluorescent bulb is best for my tomato seedlings?

When it comes to growing tomato seedlings, or starting other vegetables indoors from seed the light intensity is more important than the color. Blue light is better for vegetative growth than red ...
5 votes
Accepted

Am I meeting the light requirements for indoor dwarf citrus trees?

I don't know the specific requirements for those trees. However, that should be way more than enough for a nice leafy citrus tree if my 20-year-or-so old grapefruit tree is an indicator. We usually ...
5 votes

Is sunlight from my window enough to grow cherry tomato seedlings indoors?

Unfortunately, that level of light is probably not direct or strong enough to support the seedlings. Even if it was, seedlings reach for the light, so they'll not only be leggy, meaning with tall but ...
5 votes

T5 AgroLED, Hortilux PowerVEG FS + UV, UV and Mold

Someone can answer the specific questions but normally led grow lights have no or minimal UV emission unless specifically added. The manufacturer of the second light says the UV is there to enhance ...
5 votes

Can you have a shade-loving plant under full sun?

To understand the needs of any house plant, you need to take a closer look at its natural habitat. In our homes, we try to mimic those conditions as well as we can and breeders have been working hard ...
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5 votes

Is this night lamp setup helpful or harmful for seedlings?

Does nothing, Vivid, for the plants. Plants need dark as well as light. These baby plants need acclimation when you want to transplant them elsewhere. I am unable to see your pots clearly, is this ...
  • 39.9k
4 votes

Can plants have too much light, or do they need night/rest?

I would like to point out that plants do not have an "anaerobic" phase. Plants ALWAYS "breathe" O2. Just the net balance during the day is the production of O2 by photosynthesis because that only ...

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