Large Greenhouse Grow Lights That Cover Serious Ground
For covering a large greenhouse, the Spider Farmer SF-7000 stands out as the top overall pick due to its massive 700W output and impressive 6×6 foot coverage, but it requires a dedicated 240V circuit and generates significant heat.
Greenhouses demand lighting that can match the scale of the space. A single small panel simply won’t cut it when you’re growing rows of tomatoes or racks of seedlings. Large capacity grow lights are designed to cover expansive areas with intense, uniform light.
These lights are not just about raw power. They need to be efficient, durable, and easy to install. We compared seven of the most popular models to help you find the one that fits your greenhouse’s unique footprint.
How to choose
What we recommend
Spider Farmer SF-7000 LED Grow Light
The Spider Farmer SF-7000 is a behemoth in the grow light world, designed to replace a 1000W HPS while drawing only 700W from the wall. It features Samsung LM301B diodes for high efficiency and a wide 6×6 foot coverage area at 24 inches above the canopy. Owners report excellent light penetration through dense foliage, making it ideal for fruiting plants like tomatoes and peppers. The light is daisy-chainable, allowing multiple units to be connected and controlled from a single outlet.
Pros
- Huge coverage area with intense PAR output
- High efficiency with Samsung diodes
- Daisy-chainable for easy expansion
Cons
- Requires 240V outlet for full power
- Heavy unit needs sturdy mounting
VIVOSUN VS4000 LED Grow Light
The VIVOSUN VS4000 offers a balance of power and affordability, covering a 5×5 foot area with 400W of actual draw. It uses Samsung LM301B and LM281B diodes for a full spectrum that supports all growth stages. The light includes a dimming knob and a separate UV/IR switch, giving growers control over light intensity. Many users note that it runs cooler than similar lights, which is a plus in enclosed greenhouses.
Pros
- Great price for the coverage area
- Dimmable and separate UV/IR control
- Runs cool with passive cooling
Cons
- Not as powerful as 700W+ models
- No daisy-chain capability
Growers Choice ROI-E720 LED Grow Light
The Growers Choice ROI-E720 is engineered with a unique bar design that ensures uniform light distribution across a 6×6 foot area. It draws 720W and features Samsung LM301H diodes for superior efficiency. The light is IP65 rated, making it resistant to dust and moisture, which is critical in a greenhouse environment. Growers appreciate the low profile and the ability to hang it at various heights without hot spots.
Pros
- Exceptional light uniformity across the canopy
- IP65 water resistance for humid greenhouses
- High efficiency with LM301H diodes
Cons
- Premium price point
- Requires separate controller for dimming
Phlizon PH-B1000 LED Grow Light
The Phlizon PH-B1000 is a massive 1000W equivalent LED that actually draws about 450W, making it an energy-efficient option for covering large areas. It offers a coverage of 5×5 feet and uses dual chips to deliver a full spectrum. This light is known for its robust build and strong light output, though it tends to run warmer than some competitors. It is a popular choice for greenhouse growers looking to replace multiple smaller lights.
Pros
- Very high light output for the price
- Covers large areas with intense PAR
- Sturdy aluminum housing
Cons
- Heavier and bulkier than panel lights
- Heat management could be better
Mars Hydro FC-6500 LED Grow Light
The Mars Hydro FC-6500 is a foldable bar light that draws 650W and covers a 5×5 foot area. Its bar design allows for better light penetration and air flow, which is beneficial in tall greenhouses. The light uses Samsung LM301B diodes and includes a dimming knob for adjustable intensity. Users report excellent results in commercial settings, noting the even spread and low energy consumption.
Pros
- Foldable design simplifies installation and storage
- Outstanding energy efficiency
- Even light spread with bars
Cons
- Requires additional driver for remote mounting
- Not waterproof (IP65 is extra)
HLG Tomahawk 750 LED Grow Light
The HLG Tomahawk 750 is a workhorse designed for heavy-duty use. It draws 750W and provides coverage for a 6×6 foot area. The light features passive cooling with large heatsinks, eliminating the need for noisy fans. It uses top-bin Samsung and Osram diodes for high efficiency and longevity. Greenhouse operators appreciate the rugged construction and the fact that it can run for years without issues.
Pros
- Passive cooling means no moving parts to fail
- Built like a tank for commercial use
- High PAR output with quality diodes
Cons
- Heavy and may require extra support
- Premium price tag
Gavita Pro 1700E LED Grow Light
The Gavita Pro 1700E is a top-tier LED light that replaces 1000W DE HPS lamps while consuming only 645W. It provides a massive 6×6 foot coverage with a unique spectrum tuned for photosynthesis. The light is built with a modular design that allows for easy service and upgrades. It is trusted by professional growers for its reliability and performance in large-scale operations.
Pros
- Industry-leading efficiency and light quality
- Modular design for easy maintenance
- Proven in commercial greenhouses
Cons
- Very high price point
- May require professional installation
How they compare
| # | Model | Wattage | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Spider Farmer SF-7000 LED Grow Light | 700W actual draw | Best overall for large greenhouses | 9.4 | Check price |
| 2 | VIVOSUN VS4000 LED Grow Light | 400W actual draw | Best value for large greenhouses | 9.0 | Check price |
| 3 | Growers Choice ROI-E720 LED Grow Light | 720W actual draw | Best for even light spread | 9.2 | Check price |
| 4 | Phlizon PH-B1000 LED Grow Light | 450W actual draw (1000W equivalent) | Best for huge coverage on a budget | 8.8 | Check price |
| 5 | Mars Hydro FC-6500 LED Grow Light | 650W actual draw | Best for high ceilings | 9.1 | Check price |
| 6 | HLG Tomahawk 750 LED Grow Light | 750W actual draw | Best for durability and heat dissipation | 8.9 | Check price |
| 7 | Gavita Pro 1700E LED Grow Light | 645W actual draw | Best for professional greenhouse operations | 9.3 | Check price |
Common questions
How many grow lights do I need for a 10×10 greenhouse?
It depends on the coverage area of each light. If you choose a light that covers 5×5 feet, you would need four lights to cover 100 square feet. For lights covering 6×6 feet, you would need at least three lights, but four would provide better overlap and uniformity.
What is the best hanging height for large grow lights?
Most manufacturers recommend hanging the light 18 to 24 inches above the canopy for optimal light intensity. However, this can vary based on the light’s power and the plant’s light tolerance. Always start at the recommended height and adjust based on plant response.
Can I use regular LED bulbs for greenhouse growing?
Regular household LED bulbs are not suitable for growing plants because they lack the specific spectrum and intensity needed. Grow lights are designed to emit photosynthetically active radiation (PAR) that plants can use. For a greenhouse, you need dedicated grow lights with high PPFD output.
Do I need a special electrical outlet for high-wattage grow lights?
Many high-wattage grow lights, such as those drawing over 600W, may require a 240V outlet to operate at full power. Some models can run on 120V but may be limited in output or require a special plug. Check the specifications of your light and consult an electrician if necessary.
How long should I run grow lights in a greenhouse?
The photoperiod depends on the plant’s growth stage. For vegetative growth, 18 hours of light and 6 hours of dark is common. For flowering, 12 hours of light and 12 hours of dark is typical. Some greenhouse growers use lights to supplement natural daylight, extending the day length to 14-16 hours.
What is the difference between full spectrum and white spectrum grow lights?
Full spectrum lights include a wide range of wavelengths, including blue, red, and sometimes UV and IR. White spectrum lights mimic natural sunlight and appear white to the eye. Both can be effective, but full spectrum lights are often more targeted for plant growth, while white lights may be more pleasing for visual inspection.
Are LED grow lights safe to use in humid greenhouses?
Yes, but you need to ensure the light is rated for moisture. Look for an IP65 rating or higher, which means the light is protected against dust and water jets. Many commercial grow lights are designed for damp environments, but check the manufacturer’s specifications before exposing them to high humidity.
Can I daisy-chain multiple grow lights together?
Some grow lights support daisy-chaining, allowing you to connect multiple units to a single power source and control them with one controller. This is convenient for large greenhouses. Check if the light you choose has this feature, as it can simplify wiring and control.
How much heat do LED grow lights produce compared to HPS?
LEDs produce significantly less heat than HPS lights for the same amount of light output. However, high-wattage LEDs still generate heat that must be managed. Passive cooling designs dissipate heat without fans, but they may raise the ambient temperature in a greenhouse. Proper ventilation is essential.
What is PAR and why is it important?
PAR stands for Photosynthetically Active Radiation, which is the range of light wavelengths (400-700nm) that plants use for photosynthesis. A grow light’s PAR output is measured in micromoles per square meter per second (µmol/m²/s). Higher PAR values mean more usable light for plants, leading to faster growth and higher yields.
Final word
For most large greenhouse growers, the Spider Farmer SF-7000 is the best overall choice because it offers a perfect balance of power, coverage, and efficiency at a reasonable price. If you are on a tighter budget, the VIVOSUN VS4000 provides solid performance at a lower cost. For commercial operations that demand the highest efficiency and reliability, invest in the Gavita Pro 1700E. Whatever you choose, ensure your greenhouse has adequate structural support and ventilation for these high-output lights.
Sierra Daniels
Sierra's background is in landscape design and nursery retail. She focuses on lawn and garden equipment, outdoor furniture and gear durability, weighing published specs against how materials actually hold up outside.
