Growers Choice ROI-E420 LED Grow Light

Growers Choice Brand Product

Commercial Grower? Get Volume Pricing.

Availability: In stock

Lead time: This product ships in 1-2 Business Days

This item ships free!

  • Coverage Area
    Veg: 4' x 4'; Flower: 3.5' x 3.5'
  • Exact Watts
    420 Watts
  • LED Light Spectrum
    Full Spectrum
  • Total PPF Output
    1090 PPF
  • PAR Efficiency
    2.6 umol/J
  • Dimmable:
    with Manual Dimming Knob, with Optional Controller
  • LED Diode Type
    Osram Top Bin Diodes
  • Voltage
    120-277 Volt
  • Power Cord(s) Included
    120 Volt Cord with 240 Volt Adapter
  • Est. Electricity Cost /mo
  • Warranty
    3 Year

Growers Choice Product Documents

ROI-E420 Spec Sheet

ROI-E420 User Manual

The ROI-E420 is the perfect balance between energy efficiency and performance

From the minds of both Grower's Choice & TSL Horti Tech, the same pair that brought out the ROI-E680, one of the best LED Grow Lights in the industry. Introducing the ROI-E420 full spectrum, compact horticulture LED fixture. Utilizing Grower's Choice proven 3K full PAR spectrum, this LED is perfect for professional cultivators and grow enthusiasts alike, who require a powerful LED fixture with a lower profile frame. This new, sleek LED is also perfect for the hobby growers or entry level professional cultivators who want to maximize their yields while working with limited space.

Whats Included

  • ROI-E420 LED Grow Light
  • 9' Connecting Cable
  • 1' 120 Volt - M25 Plug
  • Information Page
  • 120/240 Volt Adaptor
  • User Manual
  • Rope Ratchet

Not Included

  • Light Controller
  • RJ Data Cable
  • Glasses

This fixture performs best using a 4ft x 4ft veg and 3.5ft x 3.5ft flower footprint, perfect for compact gardens and cultivation tents with a Recommended Hanging Height of between 6" and 24".

Minimum hanging height

Top Features of the ROI-E420

Full Phase Spectrum

This fixture delivers the entire spectrum of light to your plants, giving them exactly what they need to grow big and beautiful. Grower's Choice famous GC-3K Full Phase Spectrum for will bring your plants to new heights with the best possible LED diodes available.

High Performance & Energy Savings

For growers with strict requirements on power, this fixture cranks out 1090 umols/s. At 420 Watts of power, that gives this system an PAR efficinecy of 2.6 umols/J. With dimming capabilities and a voltage range of 120 Volts - 277 Volts, you truly can find the perfect amount of power output and consumption. The ROI-E420 truly gives you a return on investment with up to 40% energy saving & 40% less HVAC requirement.

Compact Size

This fixture is approximately 3 ft in length (35.3") & width (34.6") making it a great fixture for 4' x 4' or 5' x 5' grow tents for the hobby grower and can even fold when not being used to reduce its storage size in half. Even with the compact size, the ROI-E420 still packs enough power to be used in commercial applications.

ROI-E420 Half Folded

Onboard Dimming

You can set the ideal intesity at any time for optimal plant growth without the use of an external controller. If you prefer an external controller, no problem. This fixture is compatible with most lighting contollers including Growers Choice Master Lighting Controller. With the GC master controller, cultivators can set the fixture to turn off and on at desired times, program sunrise/sunset settings, program dimming options and set protective fail safes to dim or turn off fixtures in the event of excessive room temperatures, such as in the event of HVAC failure, potentially saving gardens from heat damage.

Growers Choice Master Lighting Controller

Master Lighting Controller

Grower’s Choice digital lighting controller enables the grower to control up to 200 fixtures. It is compatible with all GC-315 CMH, GC-630NS CMH, GC-1000 DE fixtures, ROI-E420 & ROI-E680 LED grow light.

This dual-channel controller allows daisy chaining up to 100 fixtures per zone. En-abling complete control of your growing environment with timed on/off switching, sunrise/sunset, and precise temperature readings with dual thermal probes and thermal-threshold auto dim-shutdown for additional protection.

Specifications for the ROI-E420

Light SourceLED
Voltage120 Volt208 Volt240 Volt277 Volt
Amperage4.0 Amps2.5 Amps2.0 Amps1.8 Amps
SpectrumGC-3K Full Phase
PPF*1090 μmol/s
Input Power*420W
Efficacy2.6 μmol/J
Fixture Dimension | Weight35.3” L x 34.6” W x 3.2” H | 19.4 lbs.
Mounting Height≥6” (15.2cm) Above Canopy
Thermal ManagementPassive
Dimming0 - 10 Volt
Light Distribution120 degrees
LifetimeL90: >54,000 hrs
Power Factor> 90%
CertificationsIP65, ETL, CE
Warranty3 Years Standard Warranty

* PPF calculation compiled using Growers Choice in-house integrating sphere measurements and typical spectrodiometric data for each LED to determin the fixture performance. Actual photometric results may vary within the LED's manufacturers bin tolerance

* Wattage values are typical expected values. TSL Horti Tech maintains a tolerance of 10% range on flux and power consumption. Target light level can vary from projected levels depending on ambient temperature, room reflection values, and other conditions.

Tech Specs


BrandGrowers Choice
Weight (lb.)19.4
Prop 65No
Length (in.)35.3
Width (in.)34.6
Height (in.)3.2
Warranty3 Year
Lead TimeThis product ships in 1-2 Business Days
Lighting TypeLED
LED Light SpectrumFull Spectrum
LED Fixture TypeMulti-Bar
LED FeaturesManual Dimming Knob, Dimmable *with Controller
Est. Electricity Cost /mo$18.14
Exact Watts420 Watts
Suggested Hanging Height6" - 24"
LED Diode TypeOsram Top Bin Diodes
PAR Efficiency2.6 umol/J
Total PPF Output1090 PPF
Power Factor>90%
Voltage120-277 Volt
Amps4.0 Amps @ 120 Volts, 2.5 Amps @ 208 Volts, 2.0 Amps @ 240 Volts, 1.8 Amps @ 277 Volts
Power Cord(s) Included120 Volt Cord with 240 Volt Adapter
Power Cord Length10 ft.
Coverage AreaVeg: 4' x 4'; Flower: 3.5' x 3.5'
Grow Light CertificationsIP65 Rated, ETL Listed
UL ListedNo

Growers Choice ROI-E420 LED Grow Light Reviews

Great product
Have been using this light for flower for the last 6 months. The plants are much happier, thriving and producing terps like never before. In my opinion much better than the 600 watt hps it replaced.

Best LED performace for the price
I'm in a 4x4 tent, so the 680 or 720 would not fit perfectly, so O moved down to this one, and I'm beyond ecstatic with my decision to get the LED. So incredibly bright but run soo cool. No fans to break. the controller works amazingly. plus it a really beautiful LED, I know what does not matter, but it still looks fantastic!

Works Great
I use this in a 3x3 ... I can see how it would be great in a 4x4 as well.
I have healthy and happy plants.

Blows away 600 watt HID but too big for 3x3 tent
I've had this fixture for a few days now. It was my first serious venture into LEDs after much experience with the old methods. I used a PAR meter to compare it to a somewhat aged 600 watt Eye Hortilux Blue MH and it wasn't even close in coverage or intensity. The biggest challenge is figuring out how much of this light my plants can take during the various stages. The dimming feature is useful but there are only 4 settings in 25% increments using the onboard dimmer. More precise increments are most likely available using external controllers. It would be nice to have more dimming options out of the box but something is better than nothing.

One very important note on this light is that it will not fit in a standard 3x3 foot tent that measures 36x36 inches on the outside (e.g. DR90). The internal growing area is reduced by the poles enough to keep this light from fitting. However this light is perfect for a 1 meter square (40 inches) such as the Sun Hut. It would also work in a 4x4 tent but the outside edges would suffer slightly from a steep dropoff in PAR outside the frame of the fixture.

Overall, I'm very impressed with this light but was slightly disappointed that I didn't plan well enough to realize that this light wouldn't fit in my 3x3 test tent. I feel this should be called out in the product description. I was able to adapt but not all growers will have that option. I will report back later after a more thorough test.