LED Grow Light

UVB Grow Light: Benefits, Types, & Best Options

UVB grow light

Harness the Power of UVB Grow Light for Plants

Plants require a variety of light spectrums to thrive and reach their full growth potential. While most growers are familiar with the importance of visible light for photosynthesis, say, the blue or red light, another crucial component often goes unnoticed: ultraviolet B (UVB) light. 

As a type of UV lighting for plants, UVB light plays a vital role in plant development, just as other growth light does. Understanding how to utilize it through UVB grow light can effectively boost your indoor gardening. Let’s dive in to see more details. 

Table of Contents

How Does UVB Light Work to Benefit Plants

In case you don’t know, UV light is classified into three main types based on their wavelength: UVA (320-400 nm), UVB (290-320 nm), and UVC (100-290 nm). While there is no verdict on which type of UV light is best for cannabis growing, researchers have found evidence of how UVB light benefits your plants. 

According to a study about the UVB radiation on photosynthesis, growth, and cannabinoid production, cannabis grown and exposed to UVB light was found increased THC and CBD concentrations compared to the plants not grown under UV lights at all. 

In addition, advantages of applying UVB light to your weed plants include the following:

Enhanced Secondary Metabolite Production

UVB light exposure stimulates the production of secondary metabolites in plants, such as flavonoids, terpenoids, and phenolic compounds. UVB light acts as a signal to the plant, triggering the synthesis of these compounds, which can enhance the plant's aroma, taste, and medicinal properties.

Plant Metabolite

Plant Metabolite Source: cell.com

Altered Morphology and Growth

UVB light can induce changes in plant morphology and growth patterns, promoting compact growth, increasing leaf thickness, and enhancing overall plant structure. This can be particularly beneficial for certain crops, such as herbs or ornamental plants, as it helps to produce more robust and visually appealing plants.

Read more: Cannabis Leaves Curling Up

Increased Disease Resistance

UVB light can activate various defense mechanisms, such as the production of phytoalexins and pathogenesis-related proteins, which help plants fend off pathogens. By incorporating a UVB grow light into the cultivation, growers can enhance the plant's natural ability to defend against diseases, reducing the reliance on chemical interventions.

Stress Adaptation

UVB light exposure can help plants adapt to environmental stressors. It stimulates the synthesis of specific proteins and antioxidants that protect plants from oxidative stress caused by high light intensity, fluctuations in grow tent temperature, etc. 

Types of UVB Grow Light

Before jumping into buying one UVB grow light after reading all the advantages of it, there are several options for UVB grow light in the market, and each one of them shares different pros and cons. Let's explore the common 3 types, fluorescent UVB grow lights, LED UVB grow lights, and HID UVB grow lights. 

LED UVB Grow Lights

If you don’t have time to read all this but are eager to find out the best UVB grow light, this is it. UVB LED grow light is so far the most advanced and efficient practice for UVB grow light. Specifically designed to emit UVB light in the desired wavelength range, the UVB LED grow light can easily meet precise requirements when it comes to UV lighting. 


  • The LED grow light is proven to be the most energy-efficient when compared to all other types. 
  • A longer lifespan than traditional light tubes. 
  • Precise control over the growth light spectrum, allowing for tailored UVB output.
  • Compact and versatile design for easy installation and scalability.


  • Higher upfront cost compared to other UVB grow lights.
  • Limited coverage area per fixture, may require multiple units for larger spaces. Fortunately, you can purchase an individual UV grow light bar whenever needed. 

UV grow light bar

HID UVB Grow Lights

High-Intensity Discharge (HID) UVB grow lights commonly utilize metal halide (MH) lamps. This type of UVB grow light provides intense and concentrated UVB radiation and is suitable for large-scale commercial operations or situations where high light intensity is required. 


  • Provide intense and concentrated UVB radiation.
  • Good penetration and coverage area per fixture.
  • Compatible with light movers or light rails for even light distribution.
  • Widely available in the market with a wide range of options, ranging from affordable ones to upscale ones. 


  • Since it produces higher light intensity, it makes sense that HID UVB grow light results in higher energy consumption and operational costs.
  • Generate more heat, requiring efficient cooling and ventilation systems.
  • Shorter lifespan compared to fluorescent or LED UVB lights, as bulbs need to be replaced periodically.
  • Require proper safety precautions due to the high-intensity light output.

Fluorescent UVB Grow Lights

Fluorescent UVB grow lights are another best UVB grow light option, and is particularly suitable for starters. This type of UVB grow light typically uses fluorescent tubes that emit UVB light in addition to visible light.


  • Energy-efficient and cost-effective compared to HID lights.
  • Offer a wide range of sizes and configurations for various setups.
  • Relatively long lifespan compared to HID lights.


  • Lower UVB intensity compared to other types of UVB grow lights.
  • May require closer proximity to plants for effective UVB exposure.
  • Can generate more heat compared to LED UVB lights.

Full Review of the Top 3 UVB Grow Light

It would be a bit hard to target UVB-only grow lights, fortunately, there are many full-spectrum grow lights that cover UV lighting. We’ve curated a list of the top 3 best UVB grow lights in the following. 

MIGRO UVB 310 Fixture & Fluorescent Tube


As a specialized grow light fixture that is designed to provide UVB light, this UV grow light from Migro adopts a system output of 75% UVB and 25% UVA, with a spectrum peak at 310nm (UVB). 


  • This best UVB grow light enhances the production of secondary metabolites in your cannabis, such as Flavonoids and Terpenes, resulting in an improvement of up to 40% in the taste and aroma of your yields.
  • Delicate UVA and UVB output and ratio to increase the overall health of your plants. 
  • With a specially finished Aluminium reflector, MIGRO UVB grow light is able to redirect 40% more UVB photons onto the grow area compared with a normal UVB grow light. 


  • Limited usage as it can only be applied to the last few weeks of the flowering stage.
  • Limited light spectrum as it only contains UV light. If you are looking for a more versatile full-spectrum grow light, this is not your choice. 

Spider Farmer SF1000 LED Grow Light 

SF1000 led grow light

The Spider Farmer SF1000 LED Grow Light is a popular choice among indoor growers for its exceptional performance and features. This full-spectrum light is designed to provide optimal lighting conditions for plants throughout their growth stages. Let's delve into the details.


  • SF1000 LED grow light utilizes the latest LED technology today - Samsung LM301B diodes, to deliver powerful light output and uniform canopy penetration to resulting maximum higher yields. 
  • As a full-spectrum LED grow light, Spider Farmer SF 1000 includes white, blue, red, and IR hues that benefit all stages of your plant growth. The light is evenly distributed across the plant surface, penetrating deeply into the roots and lower canopy, ensuring consistent and top-quality flower production.
  • With the dimmer knob, you can easily adjust the light intensity whenever necessary. This is a particularly excellent design for large growing areas and commercial cultivation, where multiple lights can be connected and controlled simultaneously with synchronized dimming.


  • This UV light only contains a relatively short range of UV wavelength, so if you are looking for UVB light only, the MIGRO one may be a better choice. 
  • There’s no cooling fan in the grow light, so it’s likely to generate more heat while working and cause the temperature to rise in your grow room. Fortunately, a good inline fan can solve the dilemma. 

T8 UVB Grow Light

T8 UVB grow light

As a long-lasting item for indoor growing, the T8 Grow Light has a fair reputation in the industry. 


  • This UV grow light offers a complete range of wavelengths, from 400 to 800nm, utilizing 312 high-brightness light chips. This full spectrum lighting provides a high photosynthetic photon flux density (PPFD) that makes it ideal for indoor plants.
  • These T8 grow light strips come with adjustable reflectors, allowing you to easily modify the illumination range by changing the reflector angle. 
  • These grow light strips are designed for easy installation, surpassing the complexity of traditional plant lights. 


  • One drawback of T8 UVB grow lights is their relatively lower UVB intensity compared to some other UVB grow light types, such as LED grow lights or high-output fluorescents. 
  • T8 UVB bulbs typically have a moderate lifespan and need to be replaced more frequently compared to LED grow lights. Regular bulb replacements are necessary to maintain optimal UVB output and prevent diminishing light intensity over time.
  • Like other fluorescent grow lights, T8 UVB lights can generate more heat compared to LED counterparts. Growers need to ensure proper ventilation systems to prevent excessive heat buildup in the growing environment.


UVB grow lights provide specific UVB wavelengths that offer numerous benefits, including increased production of secondary metabolites, improved plant resilience, and enhanced flavors and aromas in harvested crops. To harness the power of UVB radiation for optimal plant growth and development, simply pick one from the list of the best UVB grow light. 

FAQs about UVB Grow Light

  • Can UVB be used as a grow light?

Yes, UVB light can be used as a supplemental grow light. While plants primarily require light in the visible spectrum (400-700nm) for photosynthesis, exposure to UVB light can stimulate the production of secondary metabolites such as flavonoids and terpenes, which contribute to enhanced flavors, aromas, and nutritional qualities in crops.

  • Do plants need UVA or UVB to grow?

No, plants do not require UVA or UVB light for basic growth and development. However, exposure to UVA and UVB light can contribute to photomorphogenesis and stimulate the production of secondary metabolites. 

  • What does UVB do to plants?

Key impacts of UVB radiation on plants include secondary metabolite production, photomorphogenesis, DNA damage and repair, and stress response. However, excessive or prolonged UVB exposure can inhibit plant growth and reduce photosynthetic activity.


About Ciki

Ciki has been navigating the digital world of SEO for over 3 years, applying her expertise originally in the software sector before turning her attention to indoor gardening. Merging her tech-savvy background with a passion for nature, Ciki offers a unique perspective on gardening, blending modern techniques with time-honored traditions.

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