UNIFUN 45w LED Grow Light Review

  • Veg Area coverage: 1.5 sq meter at 12-18 inches distance
  • Flowering Area coverage: N/A
  • Power: 45 watts
  • Dimensions: 12.2 x 12.2 x 1.38 inches
  • Warranty: 12 month warranty + 30 days money back guarantee
  • Spectrum: Red/Blue, plus UV and Infrared
  • Weight: 2.2 lbs
  • Lifespan: 50,000 hours
  • Good for: Beginners / Germination area ​/ Supplemental lighting
  • Price: Check latest price on Amazon →

What we like…

  • Low price
  • Compact and lightweight
  • Great for small grow spaces
  • Hangs perfectly in a closet grow space
  • New model includes UV and IR wavelengths

What we don’t like…

  • Low power will produce mediocre results
  • No PAR values provided by manufacturer

The UNIFUN 45w LED grow light is the perfect light for a first-time indoor grower who is starting off with one small plant and a small budget.

Although you could use this light to grow a single cannabis plant for it’s full lifecycle, you would most likely get mediocre results when flowering. This light just doesn’t have the power to penetrate a cannabis plant fully while in the flowering stage. However,  we think it makes an excellent light for growing a single plant before switching to a more powerful light for flowering. The new version of this light now comes with UV and IR, which should help improve grow times and potency. We also love that this light is perfectly sized for hanging in a tight or discreet space, such as a closet.

If you’re a beginner looking for a light that will work for one small plant and you’re not too worried about maximum returns, look no further 🙂

Need something more powerful? However, if you’re looking for a grow light that will provide better results when flowering, we recommend a more powerful light such as the VIPARSPECTRA 300W or VIPARSPECTRA 600w. These are our two overall favorite LED grow lights on the market right now.

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UNIFUN 45w LED Grow Light Review

For new growers who are on a budget, choosing the right LED grow light can be a real challenge.  At a low price point, you’re definitely going to be skimping on a feature or two, and unless you’re a cannabis guru, it’s hard to know when it’s safe to cut corners.

Here at GreenBudGuru, we’ve researched and reviewed the best LED grow lights on the market.

Today we’re featuring the UNIFUN 45w LED grow light, which took home 2nd place in the Best Budget Grow Lights category in our Best Lights for Growing Weed awards!

In this review, we’re going to cover:

  • Features & Build Quality
  • Color Spectrum/PAR Value
  • Coverage
  • Warranty

Who is this grow light for?

This budget LED grow light is great for beginners looking to setup a small, discreet grow space or germination area ( such as in a closet ) as the light comes with an easy-to-hang hook. It can also be used by beginners to grow a single plant ( if you’re not too worried about mediocre results ) This might be a good option if you’re just testing dipping your toes in to growing weed is something you’d like to do.

​Who is this grow light NOT for?

This LED grow light is not for growers looking to grow more than one plant. This light has a small coverage area and a low power output ( 45w ) Unless you’re simply looking to create a separate area for growing seedlings, you’ll need to invest in a more powerful light. We suggest that you checkout the  VIPARSPECTRA 300W or VIPARSPECTRA 600w which will produce far superior results.

What’s in the box?

This is a simple plug-and-go LED, which means you won’t need a lot of additional supplies.  Everything you need to get stared is right there in the box, including:

  • UNIFUN 45w LED grow light
  • 4 ft Power cord
  • Hanging kit
  • User manual

Features & Build

Growers who are working on a tight budget need lighting that can tick as many boxes as possible, and the UNIFUN 45w LED grow light really fits that bill well.


This light can be hung from any bar or rod with the simple hook latch, which means it can fit in smaller makeshift grow spaces such as closets.  Because of it’s slim and lightweight design, it can also be mounted to a flat surface using double-sided foam tape (not included).

At only about 13″ x 13″, this LED light is super compact, which means it can fit into even the tiniest of grow spaces.


There are two light colors that are cannabis plants require; red and blue. Seedlings and clones need red light the most during the first couple months.

A new seedling searches for red light, which provides the right nutrients it needs to grow.  If it has a hard time finding the right kind of red light, it will begin to stretch taller and thinner, focusing its energy on reaching a place where red light is abundant.  This is why cannabis plants grown outdoors can reach 6′ tall, or taller!

Most in-home growers, however, don’t have the kind of vertical space to grow a plant that tall.  That’s why a heavy helping of red LEDs is so beneficial – red light helps your plant grow shorter and wider, preserving that valuable vertical real estate.

The ratio of red light to blue light in the UNIFUN 45w LED grow light is roughly 3:1, which is perfect for young cannabis plants.


At 20″ from the top leaves ( the canopy ) the UNIFUN 45W grow light should cover roughly 1.5 square meter.  This is the perfect size for someone planning to grow one plant at a time.

PAR Output

PAR has become one of the best ways to calculate your light’s effectiveness, replacing other measurements like wattage and lumen. It’s important to know the PAR Output of your LED grow light, which makes it a little disappointing to know that UNIFUN hasn’t provided any information about the PAR of this one.

Since this LED isn’t made specifically for cannabis growing, we don’t have statistics on PAR output.  Luckily, we’ve done the research and can make some educated guesses about the PAR output based on the number of LEDs and comparable models.

In general, you’ll want seedling and clones to receive a lower PAR Output, somewhere between 200 and 400. As your marijuana plant grows, the PAR should also increase… flowering plants need a PAR value between 600 and 900.

To fall within the 200-400 PAR range with the UNIFUN 45w LED grow light, we recommend keeping the light between 10″ and 20″ away from the top of your plant.

Pro tip: remember to invest in a second LED that can take over when this light stops being powerful enough.  Usually between 4-8 weeks into the veg cycle, you’ll want to upgrade to a higher PAR LED, like the VIPARSPECTRA Reflector Series 300w LED grow light.

Warranty information

UNIFUN offers a standard 30-day satisfaction guarantee and 12-month warranty, so you’re more than covered if something goes wrong.

Let us know what you think!

Did you purchase the UNIFUN 45w LED grow light? If so, we’d love to see the results of your grow. Drop a picture of your grow space in the comments and let us know what you think of the light.Also, please feel free to ask us any questions about this grow light in the comments. Happy growing!  Interested to see if the UNIFUN made it to our list of the best grow lights?  View our results

James Alexander James Alexander
Hey, I'm James! The founder and head writer here at GreenBudGuru.com. I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

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