SKU: 41653193285

GROWERS CHOICE ROI-E420 LED Grow Light 420W

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Description

GROWERS CHOICE ROI-E420 LED Grow Light 420WMaximize Growth in Small Scale Cultivation SetupsThe ROI E420 is a full spectrum LED fixture engineered for hobbyists and professional cultivators working in compact grow spaces. With its sleek frame, proven 3K PAR spectrum, and low profile design, this 420W fixture delivers high intensity light without overcrowding your environment. Key Benefits Compact Power OutputCovers 4' x 4' veg and 3. 5' x 3. 5' flower areas with 420W efficiency 3K Full PAR

Maximize Growth in Small-Scale Cultivation Setups
The ROI-E420 is a full-spectrum LED fixture engineered for hobbyists and professional cultivators working in compact grow spaces. With its sleek frame, proven 3K PAR spectrum, and low-profile design, this 420W fixture delivers high-intensity light without overcrowding your environment.

✅ Key Benefits

✔️ Compact Power Output
Covers 4' x 4' veg and 3.5' x 3.5' flower areas with 420W efficiency
💡 3K Full PAR Spectrum
Ideal spectral blend optimized for both veg and bloom stages
📱 Plug-and-Play Simplicity
No apps or extra setup—perfect for beginners and pros
🔌 Low-Profile Build
Sits close to canopy without sacrificing coverage or power
🛡️ Reliable Build Quality
Backed by trusted Growers Choice engineering
🚚 Fast, Free U.S. Shipping
Quick delivery from authorized U.S. warehouses

Why the ROI-E420 Is a Top Choice for Small Grow Rooms

Growers love the ROI-E420 for its balance of performance and size. Whether you’re running a small indoor tent or need a powerful light for side projects, this unit offers efficiency, full-spectrum output, and an easy-to-use design—without the bulk of larger fixtures.

🔦 Feature Highlights

Low-Profile Frame
The sleek housing design allows close placement to plant canopies, making it ideal for grow tents or vertical setups.

Optimized Full Spectrum
Grower’s Choice’s proven 3K PAR spectrum supports vigorous veg growth and dense flowering for high yields.

Versatile Coverage
Covers up to 4' x 4' in veg and 3.5' x 3.5' in flower, perfect for compact gardens or supplemental lighting.

📊 Ideal Applications

  • Grow tents (3' x 3' to 4' x 4')

  • Home hobby grow setups

  • Supplemental lighting in larger rooms

  • Vertical farming systems

⚙️ Maintenance Tips

  • Wipe down lens covers every 30 days to maintain PAR output

  • Avoid exposure to humidity above manufacturer specs

  • Store in a dry, ventilated area when not in use

💡 Optimize Your Setup with the Growers Choice Master Controller
Take your lighting system to the next level by adding the Growers Choice Master Controller. This dual-zone controller manages up to 200 fixtures, enabling full scheduling, sunrise/sunset simulation, and temperature-based auto dim/shutdown. It's the perfect companion for any ROI Series LED or GC CMH setup—offering safety, scalability, and total control in one compact device.

➡️ Add it to your order today for seamless automation and enhanced performance.

Upgrade your compact grow setup with full-spectrum precision. Order the ROI-E420 today and grow smarter in less space.

📦 What's Included

  • 1x Growers Choice ROI-E420 LED Fixture

  • 1x Power Cable

  • 1x Mounting Hardware Set

  • 1x User Guide

📘 Specifications

  • Model Number: ROI-E420

  • Light Source: LED

  • Spectrum: GC-3K Full Phase

  • PPF: 1090 PPF

  • Input Power: 420W

  • Efficacy: 2.6 μmol/J

  • Fixture Dimension / Weight: 35.3” L x 34.6” W x 3.2” H / 19.4 lbs (89.6 cm L x 88 cm W x 8.1 cm H / 8.8 kg)

  • Mounting Height: 6”–24” depending on application

  • Thermal Management: Passive

  • Max. Ambient Temperature: 104°F / 40°C

  • Dimming: 0–10V

  • Light Distribution: 120°

  • Lifetime: L90 >54,000 hours

  • Power Factor: >90%

  • Certifications: UL 8800, UL 1598, IP 65, DLC

  • Warranty: 5 Years Standard Warranty

Max Amperage by Voltage Service

  • 120V: 4.0A

  • 208V: 2.5A

  • 240V: 2.0A

  • 277V: 1.8A

📄 User Manual

Spec Sheet 

User Manual 

❓ FAQ

Q: What size tent does the ROI-E420 work best in?
A: It’s optimized for 4’x4’ veg and 3.5’x3.5’ flower coverage, making it ideal for small tents.

Q: Is this fixture dimmable or app-controlled?
A: This unit does not have app connectivity but features a built-in dimming function via its driver.

Q: What’s in the box?
A: LED fixture, power cable, hanging kit, and user guide.

Q: Can I use this for both veg and bloom?
A: Yes, the 3K full PAR spectrum supports all growth stages.

Q: Does it work with satellite internet?
A: No, Growers Choice fixtures are not designed for use with satellite-based control systems.

Q: What’s the warranty?
A: Backed by a manufacturer warranty (see warranty section below).

🛡️ Warranty

5-Year Manufacturer Warranty covering all LED boards, drivers, and components. U.S.-based support included.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 41653193285

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4.4 ★★★★★
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ohtiki
Bozeman, US
★★★★★ 5
Definitely a page turner!
Format: Kindle
I really enjoyed this book! I was looking for a good, spooky book and this delivered. I went through all the emotions with this book; frustrated, sad, scared, confused...there was so much happening!! It was easy to get through this book because I wanted to know what was going to happen next. Although I loved this book, I had a lot of questions at the end, but the author could definitely write a couple more books getting deeper into the different stories introduced. I don't want to say TOO much because I don't want to give anything away, but after I finished I was like, "Nooooo!!!" LOL So, give it a read.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
B
Verified Purchase
Bob Lewis
San Leandro, US
★★★★★ 3
A great read that leaves some loose threads
Format: Hardcover
I knew next to nothing about this book going into it other than that it was a horror novel and that my book club selected it. That’s neither a point in favor of or against the book itself, but it does become relevant in a moment because my lack of background shaped how I approached it to a certain extent. But before we get to that, the basic premise here is that this young couple has moved into a new house. One day while only one of them is home, there’s a knock at the door. This family is there and they say they used to live in the house and want to look around. In the real world, most of us would find that a slightly awkward situation but not an entirely unheard of one. In a horror novel, you know it’s going to set things in motion that probably won’t end well for at least someone involved, and that is indeed the case. But, contrary to immediate expectations, this doesn’t shift into a home invasion story. Instead, it treats us to a bit of slow burn horror as this visiting family seem slightly “wrong” for reasons neither the reader nor characters can put their fingers on, and things ultimately lead in rather unexpected directions, though I won’t spoil too much there. One of the interesting things I noticed quickly is that little interlude chapters throughout the book were punctuated with bits of Morse Code, which I dutifully translated as I read and which slowly began to hint at more of what was going on behind the scenes. That was a nice touch, I thought, but the novel eventually ran even further with that idea, treating us to more substantial codes and ciphers that became increasingly difficult to decrypt or translate. Some eventually became so frustrating that I took to the Internet for aid, whereupon I discovered that to solve some of them, you actually need clues from an alternate reality game which coincided with the book’s publication, but which the novel itself never directly alluded to, so that felt like a bit of a cheat to me, though I was eventually able to gather the information needed to solve the puzzles. Ultimately, I did not find those solutions necessary to understanding or enjoying the book, so it’s not too big a deal. The book itself was engrossing and exciting throughout but left the reader feeling like we’d only just gotten the tiniest taste of a much larger mythology, and I found myself wanting quite a bit more by the end of it, and I mean that in both a good way and a bad way. It’s good because it means I found the book so good I wanted more, but it’s bad because I found the ending left far too many loose threads for my own taste. But if you like a book ambitious enough to risk feeling a bit convoluted and yet with a clear sense that the author always knew exactly what he was doing, I think you’ll like this one. Though it’s far from AS complex, I think it will appeal strongly to fans of House of Leaves. Both thematically and in terms of structure, I noticed certain parallels between those works.
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Reviewed in the United States on November 7, 2025
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Verified Purchase
Tami B
Natrona Heights, US
★★★★★ 4
Give it a Go
Format: Hardcover
I was captivated by the storyline from the very beginning. I had read numerous glowing reviews about this book, so I eagerly delved into it, eager to be swept away by the thrilling mystery that lay ahead. While there were a few instances where the chapters felt unnecessarily lengthy, the book was generally exhilarating and suspenseful. Of course, there were some predictable elements, but where's the fun in predicting everything? Overall, I enjoyed the twists and turns of this novel. However, the ending fell short of my expectations (which is a "me" problem). There were a few unanswered questions (perhaps by design), and the ending—well, let's say I wasn't a fan. Nevertheless, the Moris code and the puzzle within one of the DOCs were delightful touches that added depth to the novel.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 5, 2025
M
Verified Purchase
Megan McKernan
Whiting, US
★★★★★ 5
Confusing in the Best Way—A Chilling, Unforgettable Read
Format: Hardcover
This book completely pulled me in. It’s suspenseful, surreal, and genuinely unsettling in a way that lingers long after you put it down. The story keeps you slightly off-balance the entire time—you’re not quite sure what’s real, what’s not, or where it’s all going… but that’s what makes it so gripping. There were moments where I felt confused, but not in a bad way—it adds to the eerie atmosphere and makes the payoff even more impactful. It’s one of those books that keeps you thinking, piecing things together, and feeling just a little disturbed the whole way through. If you like psychological thrillers that are tense, strange, and a little terrifying, this one absolutely delivers. 5/5—haunting, gripping, and worth the ride.
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Reviewed in the United States on April 14, 2026
S
Verified Purchase
Shannon S.
Pawtucket, US
★★★★★ 3
Be ready to question everything and everyone…
Format: Kindle
We Used to Live Here definitely nails the creeping sense of dread and paranoia throughout the story. I constantly questioned whether Eve was truly unraveling or if she was the only person actually sensing danger, and the added news articles, interviews, and scientific discussions throughout the book made the atmosphere even more unsettling. I also connected with Eve’s struggles surrounding anxiety, people-pleasing, and past religious experiences, which added an emotional layer to the horror for me. That said, the pacing felt super uneven. Most of the story takes place over only a couple of days, but it dragged at times and honestly felt like it would work better as a movie than a book. Things finally picked up around the 70% mark, but the ending left me wanting much more explanation and payoff than we as the readers received. Overall, this was an eerie, anxiety-inducing read with a fantastic atmosphere, even if the execution didn’t fully land for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026

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