How Far Should Grow Lights Be From Plants? And How Long Should Grow Lights Be On For Each Day?

Do plants need a dark period?

Plants, shrubs and trees use sunlight for photosynthesis during the daytime, but at night they need darkness to regenerate a key compound – phytochrome. Nighttime lighting can reduce vegetation’s ability to properly create this compound.

What color of light do plants not like?

Yellow and white light have the lowest effect on plant growth. Red light impacts plant growth in several ways, including during the blooming and flowering phase. Certain specific red wavelengths will increase the production of a hormone in a plant’s vegetation that prevents the breakdown of chlorophyll.

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Do grow lights need to be purple?

This means it appears to human eyes either as a pleasant, soft pink, or even plain white! LED grow lights do not have to be purple.

How long should a plant be under a plant light?

‘ plants do require a daily respiration period of at least 6 hours per day (for seedlings) and ideally 8-10 hours for more mature plants. Therefore we do not recommend providing more than 14-16 hours per day of light, even if you are growing long-day-loving varieties and trying to induce flowering/fruit from them.

What color LED attracts less bugs?

What color LED lights do not attract bugs? Bugs can see Ultraviolet (UV), blue and green. That is why they are attracted to white or bluish lights such as mercury vapor, white incandescent, and white fluorescent. On the other hand, yellowish, pinkish, or orange are the least attractive to the bugs.

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What do blue LEDs do for plants?

Blue light provides chlorophyll production (the most active pigment for photosynthesis) in plants. Plants that receive plenty of blue light will have a strong, durable, and healthy stem and leaves. 400-500 nm wavelength range blue light is used to support stem and green leaves development.

Will plants grow under white LED lights?

While COB and white light LEDs can grow plants, with all of the energy wasted in the green spectrum they aren’t necessarily the most efficient. White LEDs only produce 40% of usable light and the rest is wasted in power consumption and heat.

How do you use LED grow lights for indoor plants?

LED grows lights should be placed from 14 to 30 inches above the plants. One of the biggest advantages of using LEDs is that they put off so little heat. So, you can place them close to your plants without worrying about burning them.

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How high should LED lights be above plants?

So the ideal way to use an LED light is to place it as close as possible to the canopy without burning the plants. In well-ventilated areas, we have found the mounting height to be as close as 6 inches.

Do plants grow faster under LED lights?

LEDs emit high quality lighting that plants thrive in.
32 You can also adjust the color to enhance growth during specific stages, which may result in bigger and healthier plants. NASA has been studying LED lighting for years. In many studies, plants grew taller and faster under LEDs than other types of artificial light.


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How long should grow lights be on?

To be effective, grow lights really need to be on for at least 8-10 hours a day. This can vary up to 16 hours, depending on the conditions. That’s why LED grow lights are so popular – when they have to be left on all day, it’s best to use an energy efficient type!

How do you tell if your lights are too close to your plants?

If your grow lights are too close to your plants, they will show some telltale signs of overexposure, much the same as they would if placed in direct sunlight for too long.

signs a grow light is too close to a plant
  1. Browning edges or burnt spots.
  2. Curling or wrinkling.
  3. Drying out.
  4. Pale or whitish coloration.


How many plants can I grow with a 100W LED light?

For a cultivation area or a grow tent of 80 x 80, you will need LED systems from 100W to 200W depending on the manufacturer. Any LED system between these watts will be enough to fully grow up to 4 plants.

What color LED lights help plants grow?

630-660 nm (Red) Light: This light is essential for germination and stem growth, as well as leaf expansion. It is also used to regulate periods of growth and flowering. Too much red light, or red light used alone, will produce tall plants that appear stretched with thin leaves.

What color light do plants grow worst in?

Green light is the least effective for plants because they are themselves green due to the pigment Chlorophyll. Different color light helps plants achieve different goals as well. Blue light, for example, helps encourage vegetative leaf growth.

Is LED better than sunlight for plants?

A plant gets about the same amount of energy from 13 hours under a grow light as it does from six hours under the sun. Plus, sunlight is free. You have to buy grow lights and pay for the energy it takes, to run them for hours at a time. So, if you’re going to grow outdoors, sunlight is usually best.

What do white LED lights do for plants?

Plants preferentially absorb red and blue light. Much of the light produced by “white” LEDs are in spectra (colors) that plants do not use. This unused light is just converted to heat within the leaves, requiring lower environmental temperatures to maintain optimal leaf surface temperatures.

What happens when LED lights are too close to plants?

Moving the grow light closer will increase the light intensity which can maximize photosynthesis. However, if the grow lights are too close above plants, they can cause wider, more sprawling growth or can even damage the plant. Plants require different levels of light depending on each stage of growth.

How long should plants be under LED lights?

To be effective, grow lights really need to be on for at least 8-10 hours a day. This can vary up to 16 hours, depending on the conditions. That’s why LED grow lights are so popular – when they have to be left on all day, it’s best to use an energy efficient type!

What LED is best for plant growth?

Choosing Grow Lights for Plants
  • Violet/blue lights typically come in a nanometer range of 400 and 530. …
  • Green light in the 500 to 620 range is ideal for plants with thick growth cover, as it can penetrate top foliage for better light retention.
  • Red light in the 600 to 730 range promotes flowering for later stage plants.

What plants grow well with LED lights?

Cool-season herbs like parsley, cilantro, thyme, chervil, turmeric, and mint also do well indoors using LEDs. Other veggies that are great for indoor growing are below ground root vegetables like radishes, carrots & parsnips (be sure to plant in deep enough soil for the mature veg).

Can plants survive on LED light only?

Yes, plants will grow under normal LED lights. Grow lights aren’t special – they’re just strong. Bright light causes plants to grow, whether they’re marketed as grow lights or not. They do need to be close to them though – the closer the better (without them burning).

Can plants get too much LED light?

The parts of the plant exposed to the excess light will show physical symptoms. You might see the leaves droop before changes in color appear. Then pale or brown spots, or yellowing leaves can occur, even as the veins remain green and looking healthy.

What happens if a plant gets 24 hours of light?

With 24 hours a day of light, plants won’t be able to access the energy stores it normally receives at night. Too much light can quickly lead to stress related-issues like vulnerability to disease, pests, or tissue damage.

What color LED is best for plants?

Blue light helps plants produce chlorophyll, the pigment they need to grow. It also helps encourage germination and root development in young plants and seedlings. Red light regulates plant growth and helps plants produce flowers and fruit. Green light helps maximize photosynthesis.

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