Can you use a UV light to grow plants?

Asked By: Gertrude Arilla | Last Updated: 15th May, 2020
Category: home and garden smart home
4.4/5 (74 Views . 21 Votes)
Yes, UV has benefits for plant growth, but it can still cause damage to plants and humans if not used properly. That full spectrum light should mimic natural sunlight to make the plants feel as if they are being grown outdoors.

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Considering this, do you need UV light to grow plants?

The answer is Yes. Plants don't require UV light to photosynthesize their food. The reason is that UV light falls within the electromagnetic spectrum which is outside the visible or photosynthetic active radiation band. UV-A can increase the level of nutrients from plants, therefore, plants will be tastier.

Subsequently, question is, how much UV light does a plant need? Plants are usually green because green absorbs yellow light best, and yellow is there the peak of solar output is. Of course, they absorb other wavelengths too, but not as much. By the time you get to UV the absorption is very small. So no, plants do not make much use of UV for photosynthesis.

Likewise, is UV light bad for plants?

UV light, particularly UV-B light can cause DNA damage to many organisms, including fungi. UV light affects plant growth and development in many ways. Because UV light has a strong potential for damaging DNA, plants can defend themselves via physical and chemical “sunscreens”.

Can grow lights hurt plants?

Myth #14: LED Lights Can't Damage Plants The reality is that modern LED grow lights can produce a very high level of light and it can cause photo-bleaching and burn leaves. This depends very much on the plant, but a PPFD of 800 is enough to damage some plants.

30 Related Question Answers Found

Can you get vitamin D from grow lights?

LED lights safer, more effective in producing Vitamin D3 than sunlight. Summary: Light from RayVio's 293nm ultraviolet (UV) LED is more efficient than sunlight at producing vitamin D3 in skin samples, research shows.

Can any LED light be used as a grow light?

Technically, yes you can use any LED lights to grow plant, but that doesn't ensure your plants will grow healthy or efficiently, as regular LED lights will not contain enough color or light spectrum which plants need to Photosynthesis. So if you want to grow indoor, It's better buy a specialized LED grow lights.

Will a UV sterilizer kill plants?

No, it's not going to affect fertilizers. General hobby grade UV sterilizers aren't going to do much to kill off pathogens either, but they are good at quelling green water algae blooms.

Can grow lights cause cancer?

The Potential Danger of UV Light For Humans
But it isn't only about skin care. Likewise, most LED grow light manufacturers keep UVC out of their supplemental UV lights. However, most UV lights will contain UVA and UVB. As you probably know, UV rays can cause skin cancer with prolonged exposure and no protection.

How much is a grow lamp?


The cost to run the lights per day is $0.2735236 or $8.20 per month. If I have an HID (high intensity discharge) light with a 600 watt bulb in it, using the same method of calculation, it would cost me $30.90 per month. Of course, with a metal halide HID light I could grow my own tomatoes and other vegetables indoors.

Do tomatoes need UV light?

UV light (specifically UV-B radiation), which stresses plants, triggers metabolic reactions that may alter the flavor and nutritional value of fruit. To test their hypothesis, the authors grew tomatoes in a greenhouse with or without UV light supplementation. (Tomatoes without UV light served as the "control" group.)

Are black lights UV?

Strictly speaking, a black light is a kind of UV light. Black lights emit ultraviolet radiation (UV light). UV is radiation with a wavelength just shorter than that of violet light, which is the shortest wavelength of light in the visible part of the electromagnetic spectrum.

What are UV lights good for?

The type of applications that use UV lamps include the curing or drying of materials such as inks and coatings; disinfection for viruses and bacteria; hygiene and infection control; fluorescent inspection; and tanning.

Can plants grow under black light?

No, most plants can not grow under a black light, if the black light is the only light source. If other light is present, they can grow under the black light, assuming it is not too strong or close to the plants. The black light itself does not do anything to help growth, though.

How do plants protect themselves from UV radiation?


Plants make their own sunscreen to block damaging rays. They bask in the sun for hours, but just like us, plants need to protect themselves from damaging ultraviolet rays. Many plants use a group of chemicals called sinapate esters to defend against the sun, while they absorb light for photosynthesis.

Are plant lights bad for your eyes?

Short Answer - No, normal use of LED grow lights do not harm your eyes. There is a common misconception that LED grow lights are harmful for our eyes; and that they may even lead to blindness.

Are LED lights UVB?

UV led bulbs are UVA, not UVB, they are for black lights and other shenanigans.

What light is best for plants?

Incandescent lights

Does UV light affect photosynthesis?

UV radiation does not affect photosynthesis at all.
But it does have an effect on plants. UV light can harm or kill microbes on plants, both harmful and beneficial ones. It can also cause DNA damage.

How long should aquarium lights be on for plants?


Most planted aquariums do not need more than 8 hours of light. Setting your lighting period for longer than 6 hours in NEW planted aquarium set-ups. During the first month your lighting period should be shorter to keep away algae while your plants grow in.

Can plants absorb light through glass?

When it comes to growing plants indoors, gardeners are typically fighting for enough light or more consistent light. It's important to know that natural sunlight coming through a window is not as strong as sunlight outside, and the intensity of the light drops rapidly the further the plant is moved from the window.

Can I leave my grow light on 24 hours?

To keep it short, Yes, you can technically leave grow lights on 24 hours per day, but this is only during the vegetative state of growth. Some people choose to only leave the lights on for 18 hours per day, even in the vegetative state of marijuana growth, which is for good reason.