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7 Best 300W LED Grow Lights 2021 – Reviews & Top Picks

Last updated: April 8, 2021

LED Grow Light-Relassy-Amazon

Low power LEDs are a solid pick for small grows or even as supplementary lighting for larger setups.

These operate for very little electrical cost and produce very little heat, making them kind of a dream for small-time growers.

Finding the best though can be a bit of a slog.

Luckily, we’re big fans of small lighting systems here and have already checked out a lot of them on the market.

We’ve set up quite a few reviews here of the best 300W LED grow lights currently available for purchase, so check them out and see if anything piques your interest!

A Quick Comparison of Our Favorites

Image Product Details
Best Overall
VIVOSUN 300W LED Grow Light VIVOSUN 300W LED Grow Light
  • Excellent for small spaces
  • Great cooling
  • Runs quiet
  • Best Value
    Second place
    Roledro UFO LED Grow Light Roledro UFO LED Grow Light
  • Inexpensive
  • Great for micro-grows
  • Premium Choice
    Third place
    PlatinumLED Grow Lights P300 LED Grow Light PlatinumLED Grow Lights P300 LED Grow Light
  • Extremely bright lights
  • Light-spectrum toggles
  • High-tech
  • Great for 2’x2’ spaces
  • Low-budget friendly
  • Relassy LED Grow Light Relassy LED Grow Light
  • Cool and quiet
  • Great supplementary light
  • The 7 Best 300W LED Grow Lights – Reviews 2021

    1.  VIVOSUN 300W LED Grow Light – Best Overall

    VIVOSUN 300W LED Grow Light

    Probably one of the nicest small-grow lights we’ve found to date. This offers all the punch of a larger light system but in a small and cool package. Ideal for when you want about two plants to take off, but don’t have the space for more.

    The VIVOSUN made for a 2’x2’ space, so grow closets or an enclosed area will be able to make the most use of it. The fans on it run quiet and do a nice job keeping the rig from over-heating as well.

    The only downside here is that it lacks a dedicated way to switch the light spectrum, though it is a full-spectrum light that will work throughout the life of a plant.

    • Excellent for small spaces
    • Great cooling
    • Runs quiet
    • Full-spectrum
    • Doesn’t have a way to change the light spectrum

    2. Roledro UFO LED Grow Light – Best Value

    Roledro 701327156592 UFO LED Grow Light

    A solid choice for budget grows of a single plant, the Roledro UFO provides plenty of full-spectrum light but only in a narrow area. Using this on an initial grow or a small-time project will result in some surprisingly dense results, just don’t expect it to handle anything close to medium size.

    Full-spectrum lights here are more than enough for this intended purpose, the power drain is almost negligible on an electrical bill, and the product is backed by a 2-year warranty. Not bad for such an inexpensive package.

    For sure one of the best 300W LEDs for the price, as long as the scale of the grow is kept low.

    • Inexpensive
    • Great for micro-grows
    • Very small light spread
    • Not suitable for more than one plant

    3. PlatinumLED Grow Lights P300 LED Grow Light – Premium Choice

    PlatinumLED Grow Lights P300 LED Grow Light

    A surprising amount of light is available from only 300W when the tech is right. PlatinumLED’s product creates massive results in small to medium-sized grows. It offers both vegetative and bloom lights, that can be toggled by a switch, or both at the same time for a massive amount of light coverage.

    What’s saved on electrical bills is paid for in the price of this lighting system, it’s definitely on the higher end of the products we’ll be going over. However, if the price isn’t a problem then this is an incredible light for grow closets and similar environments.

    • Extremely bright lights
    • Light-spectrum toggles
    • High-tech
    • Quite expensive

    4. VIPARSPECTRA V300 LED Grow Light

    VIPARSPECTRA V300 LED Grow Light

    Sturdy, powerful 300w LED meant for 2’x2’ space that works great alone, or as a pair for larger grows, but can get a bit warm without proper ventilation. This is a fairly low-budget option considering the amount of light they produce. They also have a 3-year warranty in case any of the parts fail, but it’s a pretty sturdy piece of machinery.

    We noticed the VIPARSPECTRA heated up a bit more than expected in an enclosed grow-closet. Our fans handled it just fine, though, but if using more than one a bit of extra ventilation may be required.

    • Great for 2’x2’ spaces
    • Low-budget friendly
    • Heats up a bit more than ideal

    5. Relassy LED Grow Light

    Relassy LED Grow Light

    Sunlight spectrum LED with a surprisingly effective heatsink, best used as a supplementary LED as it does not have specific bloom or vegetative functions. It’s a flat panel LED that produces a fair amount of light, though dispersion becomes an issue due to the spectrum being used. The lack of a vegetative or bloom switch makes it less than ideal for maximum growth, though it will technically work for smaller plants.

    We could see the Relassy being used as a way to get a bit of extra light penetration in conjunction with another small light, but on its own, it lacks both power and spectrum for maximum yields.

    • Cool and quiet
    • Great supplementary light
    • Is not ideal on its own
    • Lacks bloom and vegetative settings

    6. iPower 300W LED Grow Light

    iPower GLLEDXA300CNEW 300W LED Grow Light

    An underrated light, that can serve a small grow well and potentially larger with their available two-pack. This is a pretty run-of-the-mill 300W LED, but it gets a mention due to it being available as a two-pack.

    The iPower grow light offers a full-spectrum LED, no bloom or vegetative settings, and gets a bit warmer than it should, to be honest. But it has its niche for low-budget medium grows who need two small lights to get the penetration needed for healthy plants.

    Just one of these will be able to handle a small grow of one or two plants, but there are better options within the price range for a single LED lighting system.

    • Very good deal on a two-pack
    • Full-spectrum lights
    • Runs a bit warm
    • Not the best deal when purchasing in singles
    • No vegetative or bloom options

    7. CANAGROW COB LED Grow Light Bulb

    CANAGROW COB LED Grow Light Bulb

    A small, full-spectrum bulb that works alright for growing single plants, but the price-tag involved could be better used on a more robust product. The concept of the CANAGROW COB is pretty cool. It’s a screw-in LED that works with most light fixtures. It operates cool and shines a full spectrum down while having a very long bulb life space.

    Using this alone to grow a plant isn’t going to work very well though, and spending this money on a similar panel light will have better results. It could have some niche use as s supplementary lighting that is angled from below the plant, potentially, but beyond that, it’s a bit of a gimmicky light that doesn’t add much.

    • Very small and versatile
    • Expensive for the amount of light
    • Won’t handle large plants alone
    • Mostly a gimmick

    Buyer’s Guide

    With 300W LEDs, we need to look at a couple of different aspects to determine the best ones on the market.

    Light Spread

    300W, with the proper LEDs, can be more than enough to create a nice spread for a 2’x2′ area or it can be a dense amount of light on a small area.

    Checking the light spread is important for projects with limited light like this, as ones of similar power can have vastly different results depending on how big of an area they are intended to be used on.

    Light Spectrum

    Vegetative and bloom spectrums win out here for the biggest yields when they are the main source of light. However, there is something to be said about using full-spectrums and sunlight LEDs as supplementary lights to increase penetration on otherwise shady areas. Take note of this, and use the best spectrum for the situation.

    LED Grow Light-VIVOSUN-Amazon

    Image: LED Grow Light/VIVOSUN, Amazon


    300W LEDs are generally best used in budget builds already, so we made sure to give some weight to the purchase price of each of these when listing them.

    They save a bit on the price compared to more expensive bulbs, but they also tend to cut down on electrical costs by quite a bit so they’re a really good choice for things like grow closets and stealth grows.

    Still, they need to be growing lights as most high-power LEDs won’t have the spectrum needed to complete a Cannabis plant’s bloom phase. Watch out for the trap of grabbing a cheaper LED not intended for growing, it won’t be a fun process.


    When looking for a 300W LED for a small to medium grow VIVOSUN’s 300W LED Grow Light is a pretty great purchase. It covers a wide spectrum of light, and even though it doesn’t have a dedicated bloom or vegetative settings it can handle close grows well.

    For the best possible grow though, PlatinumLED Grow Lights P300 LED is well worth the price. It’s two very powerful and quality 300W LEDs in one and it has had some pretty spectacular results in trials.

    Otherwise, everything else listed here is a pretty solid choice that can handle their respective jobs well. These reviews are to help guide, they’re not the end all be all, but we hope we have helped you get a better understanding of the LED market.

    Featured Image: LED Grow Light/Relassy, Amazon