7 Best 300w LED Grow Lights To Buy in 2021

LED grow lights are widely accepted as the best grow lights for indoor cultivation, and one of the ways they are classified is by the watts. However, LED technology is so dynamic, that lights of the same wattage can vary in brightness, efficiency, and capacity. If what you need are 300 watt LEDs, we have selected and reviewed some of the best 300W LED grow lights in the market.

Why You Should Trust Us on This Guide?

With many LED grow lights, the information relayed by manufacturers about the wattage can be misleading. A lot of the lights rated 300W do not translate to nearly that amount in HID power. This should not be a major concern for the end user, but it remains a great disservice to consumer if wattage continues to be exaggerated.

We have the best interest of our readers at heart, so we have selected LED lights rated at 300W, with reasonable HID equivalents and decent coverage. Furthermore, as we are adept gardeners, we know the right features to look for in a grow light. There are so many options to choose from, so we have gone by reliable consumer reports combined with personal tests to select these products that have made it to our “best” list.

Top 300 Watt LED Grow Lights

1. VIVOSUN 300W LED Grow Light

If you need LED grow lights for indoor hydroponic, then you can’t go wrong with this Vivosun grow light. It is just as perfect for every other form of indoor cultivation, but it is more efficient when used for veg growth and flowering. With a coverage of the 1.5’ x 1.5’ for flowering at a height of 18” and 2’ x 2’ for vegetative growth at a height of 24”, it is it the best in terms of coverage, but it is really effective in the area it covers.

Interestingly, it comes with a built-in cooling fan and large heat vents, even though the light is unlikely to produce excessive heat. Furthermore, the reflector design that prevents interference with the light effect and a special chip technology that ensures a perfectly balanced spectrum for your plants. For durability, it features a sleek composite metal construction. The light is rated to last up to 100,000 hours, so you can rest assured that you will get good use out of it.


  • LED chip technology for balanced spectrum
  • Elaborate cooling system
  • It is energy efficient
  • Comes with a 3 year warranty


  • The coverage is quite small
  • Light intensity is too high

2. VIPARSPECTRA 300W Grow Light

The ViparSpectra LED Grow Light is another 300 watt light that offers optimal full spectrum lighting, needed at all plant stages from vegetative to flowering. It features a durable and fire-resistant construction that makes it one of the most durable products on our list. With 60 high intensity 5W Epiled/Bridgelux LEDs, your plants will never experience insufficient lighting. Additionally, the reflector design ensures an increased rate of PAR output by 50% and higher light penetration. With all these amazing features, it is a reasonably priced product.

It is perfect for a 2’ x 2’ vegetative coverage at 24” and a 1.5’ x 1.5’ flowering coverage at 18”. Although it is a compact unit, it comes with a daisy chain outlet through which multiple lights can be connected. As an LED light, it produces low heat, but then it comes with a unique aluminum heat sink design and silent cooling fans to prevent overheating. Furthermore, it is an energy efficient grow light. Durability is further guarantee by a 3 year warranty.


  • Cooling system is advanced
  • Multiple connection made possible by chain outlet
  • Perfect for flowering and veg
  • Increased PAR output


  • Coverage is relatively small

3. Relassy 300W LED Grow Light

Although this is a relatively new brand, it has managed to produce a functional and reliable grow light for indoor planting. This light is a fire-resistant unit that aptly replicates sunlight to help your plants produce energy required for growth. One interesting thing about this grow light is that is a 300w led grow light full spectrum that contains all wavelengths from 380nm to 800nm, and it is suitable for cultivating all types of indoor plants all through the vegetative, flowering, and fruiting stage.

It is also one of the 300 watt LED grow lights on our list that has decent coverage, perfect for a 3’ x 3’ plant area at a height of 18”. Furthermore, it is a very silent unit that does not make disturbing sound. As it does not come with a fan for heat dissipation, it features an aluminum heat back panel, with a small heat sink to prevent heat buildup as you use the light. With a 90° design, you can be sure of an increased PAR output and more coverage for your plants. Also, your plants are prevented from sunburning as a result of overconcentration.


  • Excellent coverage
  • It is silent grow light
  • Perfect for all plant stages


  • It does not features a cooling fan

4. MAXSISUN Dimmable 300 Watt LED Grow Light

This Maxsisun LED Grow Light comes with 62 Epileds/Bridgelux LEDs that produces full spectrum lighting, with IR included. The unique design incorporates a special placements of the bulbs to ensure better coverage and canopy penetration. It comes with a compact reflector the considerably increases the PAR. With a recommended placement height of 18” – 24” during vegetative growth, the light will cover 3.5’ x 3.5’. It will cover 2.5’ x 2.5’ during flowering at a recommended height of 16” – 20”. With the daisy chain feature, you get to connect more grow lights to the unit.

It doesn’t produce excessive heat typically, but it comes cooling fans and heat sinks for heat dissipation. Also, it is an energy efficient grow light consuming a low 142W of power. The dimming control makes it possible to customize the lighting intensity, while maintaining good and healthy lighting quality for your plants. Covered by a 2 year warranty, you can be sure of the durable of the Maxsisun Dimmable 300W Grow Light.


  • Produces full spectrum lighting
  • It is reasonably priced
  • Light intensity can be controlled
  • Come with cooling fans


  • It does not come with a timer
  • Cooling fans are not the quietest

5. Meizhi 300 Watt Grow Light

The highlight of the Meizhi 300W Grow Light is the reflector design that features neither plastic plate nor glass, and it greatly improves light concentration on your plants. While LED lights are typically long-lasting, this grow light features a unique Epoxy Molding Compound Chip, in contrast to the traditional chip technology in most LED grow lights. This unique chip technology makes for longer life span and optimal full spectrum lighting. It is not the best in terms of aesthetics, but it is a really functional grow light.

As an energy-efficient piece, it uses about 130 watts and produces about 200 watts of HID power. While it is suitable for all stages of plant growth, the light spectrum is particularly heavy in red, blue and white, making it best for the flowering stage. Furthermore it comes with dual veg and flower switches to meet specific lighting need at different growing stages. Also, the daisy chain features makes it possible to connect more lights. The Meizhi 300W Grow Light comes with a 3 year warranty offer.


  • Dual veg and flower switches
  • Daisy chain feature for additional light connection
  • Energy efficient
  • Strong light penetration


  • It is not the most aesthetically pleasing grow light

6. Roleadro 300W UFO LED Grow Light

Roleadro is another brand that is relatively new, but have produced a lot of dependable LED grow lights. This 300W UFO LED light is a full spectrum 9 band light, with UV and IR inclusive. The light has a predominant ratio of red and blue rays that improve sprouting and growth speed. Another impressive thing about this grow light is the cooling system. It features UL approved fans that operate quietly, and an aluminum heat conducting plate.

Compared to most 300 watt LED grow lights, it has a higher actual wattage and better lumen output. Also, the unique design ensures that light loss is kept at a minimal. Interestingly, all parts inside the light can be easily replaced if any develops a fault. Like the other LED grow lights we have reviewed, it is an energy-efficient light. While it is not the best in terms of coverage, it is really efficient in the area it covers. To further assure you of its durability, the manufacturers have included a 2 year warranty.


  • Impressive cooling system
  • Quiet operation
  • 2 year warranty


  • No daisy chain feature

7. Growstar 300W UFO LED Grow Light

The Growstar 300W LED Grow Light features advanced CREE LED Chips and it produces an advanced full spectrum that includes UV and IR. The full spectrum lighting makes it a perfect both veg and flowering stages. What impressed us the most about the grow light is the 90 – 120 degree angle design, which makes for wider coverage. Rated to last for up to 50,000 hours, this COB LED light is one of the best 300W LED grow lights you will get on the market today.

In addition, it comes with a built-in aluminum heat sink with aircraft-grade aluminum case that makes for quick heat dissipation. Furthermore, the light can effectively light an area of 30” x 30” at a height of two feet; this is the optimal coverage. However, it can cover a maximum area of 36” x 36” at a height of two feet. Even though it is rated at 300 watt, it uses a low 115 watts of power.


  • Grow light is very durable
  • It is a compact light
  • 90 – 120 degree angle design makes for better coverage


  • It is not the best in terms of coverage

Frequently Asked Questions

How many plants can I grow with a 300W LED light?

The number of plants you can grow with a 300W LED grow light depends on a number of factor. Plants need different intensity of light at different stages, and LED grow lights have varying abilities when it comes to coverage. The most important thing is to know exactly what your plants require and factor it in when choosing a 300W LED grow light. Typically, you can get the information about the coverage of 300W grow light before purchasing.

How much electricity does a 300W LED grow light use?

If you believe that LED grow lights will operate at no additional cost to your electricity bill, then you are mistaken. While an LED grow light is typically energy efficient, the electricity it uses will depend on the actual wattage of the light and the duration for which you have the light on. A lot of manufacturers provide information about the actual power consumption of their grow lights, but they are not always accurate.

How far should 300W LED be from plants?

To prevent light burns on your plants, LED grow lights should be installed at a distance from the plants. For each stage of growth, the optimal distance varies. Typically, the manufacturer should include this information in the package.

What is a 300 watt LED grow light equivalent to?

The actual HID equivalent for 300W LED grow lights vary from product to product. A lot of the grow lights rated 300W do not actually use 300W. Instead, the equivalent HID power is what the manufacturers refer to. Even as at that, not all grow lights rated 300W have that equivalent in HID power.


These are the 300W LED grow lights that have made it to our “best” list, of all the grow lights we examined. We acknowledge that some of these information can be technical, especially for people who are new to indoor cultivation. However, we advise that you first find out the lighting need of your plants, so you can know exactly what to look for in these grow lights. If you have any thoughts, please feel free to share them in the comment section below.

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