Grower's Choice ROI-E420 Horticulture LED Grow Light

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Grower's ChoiceSKU: LED-GC-ROI-E420-120V

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Sale price$499


Exclusive Limited Time Offer: customers will receive a FREE pair of Yield Lab LED grow room glasses with the purchase of the Grower's Choice ROI-E420 LED Grow Light Bundle ($29.95 value!)


The Growers Choice ROI-420 LED grow light is a high performance and cost-effective lighting solution for commercial and home horticulture. The powerful ROI-E420 LED grow light optimizes plant growth at all stages, from seedling to vegetative growth. Suitable for large indoor grow space, the full spectrum ROI-E420 meets all demands of growers looking for a natural light spectrum, while consuming less energy and reducing operating costs.

  • High Efficiency: With a total output of 1090 μmol/s and a wattage draw of 420 watts, the ROI-E420 has a 2.6 μmol/J system efficacy. So you save about 40% on electricity costs compared to HID. Additionally, lower heat output cuts cooling requirements by up to 40%.

  • Provides Full Control: The onboard dimming function lets you adjust the light output down from 0-10V when plants don’t need the full power, cutting down on your electricity costs.

  • Even Light Distribution: Because of the large 4-bar design size, the light from the fixture travels evenly across the grow space, without losing intensity.

  • 3-Year Warranty & Safety Certified: Rugged, waterproof housing makes it ideal for use wet and humid environments. Backed with a 3-year warranty.

  • Controller Available: Compatible with Grower's Choice Master Lighting Controller

The specially deployed GC-3K full phase spectrum fills the lack of the main photoreceptors and pigments outside the 660-450nm range. The GC 3k spectrum is very close to natural sunlight. The modest blues, extra red, and UV light exceed the photosynthetic needs of your plants during the flowering phase and increase the yields.

Due to the 4-bar design and a small fixture that sends light from the center, the light travels at the same distance to reach all corners. The manufacturer recommends the ROI-E420 for a 3'x3' to 4'x4' footprint, hanging at a distance of 8” above the canopy. For larger grow space and if your plants are in the vegetation stage, you can hang it 6-24” above the canopy.

This LED grow light features top bin OSRAM diodes that are considered the best diodes in the industry. These diodes have an incredible lifespan of 54,000 hours. Some of these diodes are 660nm, which is extremely beneficial for flowering. The grow light is passively cooled, so there are no active cooling fans consuming extra wattage.

You can use it with the Grower's Choice Master Lighting controller for better control over a timed on/off, sunrise/sunset, and temperature readings.

The ROI-E420 LED grow light has several safety certifications, including ETL, CE certification, and IP65 waterproof. Also, the light comes with a 3-year factory warranty from Grower's Choice.


  • Wattage draw: 420 watts

  • HPS equivalent: 800w

  • LEDs: Osram LEDs; 54,000-hour lifespan until L90

  • Spectrum: GC-3K Full Phase; Full spectrum with 660nm deep red

  • PPF (light output): 1090 umol/s

  • PPF/Watt: 2.6 umol/j

  • Beam angle: 120°

  • Coverage area: 3' x 3' (Flowering) to 4' x 4' (Vegging)

  • Mounting height: 6-24" above the canopy

  • Dimensions: 35.3” L x 34.6” W x 3.2” H

  • Cooling: Passive

  • Dimming: Dimmable on the unit, more controllability with controller (not included)

  • Operating temperature: -20°C to +45°C

  • Operating/input voltage: 110-277v AC

  • Amperage: 120V: 4.0A / 208V: 2.5A / 240V: 2.0A / 277V: 1.8A

  • Product weight: 19.4 lbs

  • Additional details: IP65; UL8800, UL1598, DLC, and CE certification

  • Recommended for: Home grows, Commercial grows, Grow rooms, Tents

  • Manufacturer's Warranty: 3 years full

    Customer Reviews

    Based on 3 reviews
    David Larsonneur
    Awesome customer service

    Delivering anything is a gamble these days. My item arrived battered with holes. Customer service was with me when I opened and inspected for damages. All was Ok.

    Gilbert Hernandez
    Satisfaction guarantied

    So far so good!! Let ya know more in 8 weeks!! 😉😃😎

    Plants love it!

    I was using cheaper leds off Amazon. The plant we’re doing ok but when I switched out with this light they went crazy! Heat seems to be better than before as an added bonus.

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