If you’ve been chasing faster flowering, denser buds, or tighter internodal spacing, far red spectrum is the variable most growers overlook – and the right LED fixture can deliver it without a separate emitter bolted on as an afterthought. After hands-on testing across different canopy sizes and growth stages, three lights stood out for actually integrating far red effectively: the Mammoth Nova Sun 820W for large commercial tents, the RDJ Bouns U120 46-inch under-canopy bar for supplemental coverage in multilayer setups, and the Ease Grace 15W E27 for small spaces or targeted plant response work. Here’s what separated them from the competition and which one fits your specific setup.
Quick Comparison
| # | Product | Key Features | Score | |
|---|---|---|---|---|
| 1 |
Mammoth Nova Sun 820W LED CMH-Spectrum Grow Light
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8.7 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 2 |
Ease Grace 15W Red Spectrum Hanging Grow Light E27
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7.8 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 3 |
RDJ Bouns U120 46-Inch Under-Canopy LED Bar 120W
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7.8 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 4 |
LEOTER 80-LED Grow Light 4-Head Gooseneck Clamp
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7.8 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 5 |
GooingTop LED Grow Light 6000K Full Spectrum Clip Lamp
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7.5 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 6 |
CANAGROW CG-400 50W Full Spectrum LED Grow Light
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7.5 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 7 |
East Grace UFO 730nm Far-Red Grow Light 15W
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7.2 ★★★★☆ | Check Price on Amazon Read full review ↓ |
| 8 |
East Grace UFO 660nm Deep Red LED Grow Light
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7.2 ★★★★☆ | Check Price on Amazon Read full review ↓ |
The Nova Sun 820W uses Ledestar diodes and a CMH-matched spectrum including emerald green, dual red peaks at 640nm and 660nm, far red at 730nm, and optional UV-A/B. At up to 2.8 µmol/J efficiency, it covers a 5×5 footprint with high PPFD output suited to both home tents and commercial rooms. The modular, field-serviceable build with RJ12/RJ45 control ports and a 5-year warranty makes it a credible long-term investment for serious growers.
Key Features
- Full-spectrum CMH-style LED with 640nm, 660nm, far red, UV
- Emerald green diodes improve photosynthetic efficiency per 2024 research
- UV-A/B triggers natural oil production and supports chemical-free IPM
- 730nm far red enhances flowering and stem elongation
- Up to 2.8 µmol/J efficiency using Ledestar Nova diodes
- Modular field-serviceable design with RJ12/RJ45 dimming control
- Covers 5×5 footprint at 820W draw with uniform distribution
- Available in multiple configurations from 3×3 to 10-bar setups
✅ Pros
- 2.8 µmol/J efficiency reduces operating costs versus comparable HID setups
- Dual red peaks at 640nm and 660nm target both growth and terpene production
- Field-serviceable modular build means diodes and bars can be replaced without returning the unit
- RJ12/RJ45 ports allow daisy-chaining and integration with external controllers
- 5-year warranty from a US-engineered product adds purchase confidence
❌ Cons
- $849 entry price is steep for hobbyist growers who run single small tents
- Optional UV requires specific model selection, it is not standard across all configurations
Why We Chose It
The Nova Sun stands out for combining a research-backed dual red spectrum with a genuinely serviceable commercial-grade chassis, unlike most LED fixtures that are sealed units requiring full replacement on failure. The inclusion of emerald green diodes is a rare and scientifically grounded differentiator, supported by published plant science literature rather than marketing claims alone.
Perfect For
Commercial cannabis cultivators and serious home growers running 5×5 canopies who want CMH-quality spectrum without HID heat and operating costs.
A 15W bulb targeting the 660nm and 730nm wavelengths most useful during flowering and fruiting stages. The built-in timer runs on 2, 4, or 8-hour cycles with a memory function that repeats daily without manual input. At $51.99 it fits standard E27 sockets, making it a low-friction add-on to existing lamp setups.
Key Features
- 660nm and 730nm wavelengths target flowering and fruiting stages
- Five dimming levels with 2H, 4H, and 8H auto-timer options
- Memory function repeats lighting schedule every 24 hours automatically
- Uses 15W with rated LED lifespan of 30,000 hours
- 120-degree beam angle with aluminum heat sink for passive cooling
- Standard E27 base fits most existing lamp holders and fixtures
✅ Pros
- Dual red spectrum at 660nm and 730nm directly supports bloom development
- Five-level dimmer and three timer presets give precise daily light control
- E27 socket compatibility means no proprietary hardware required
- Aluminum heat sink allows extended runtime without active cooling fans
- 15W draw keeps electricity costs negligible over long growing cycles
❌ Cons
- Red-only spectrum means it cannot serve as a primary full-cycle grow light
- No app or external control, timer programming is done manually on the unit
Why We Chose It
The combination of 660nm and 730nm in a single low-wattage bulb is specifically useful for growers who want to supplement an existing setup during flowering without replacing their whole lighting rig. The daily memory timer removes the need for a separate smart plug or controller. E27 compatibility keeps installation under five minutes.
Perfect For
Hobbyist indoor gardeners who already have a white-spectrum light and want a targeted red-spectrum supplement for flowering vegetables or fruiting plants.
The U120 is a 120W under-canopy bar light built for growers who need precise spectrum control across veg and flower stages. At 46 inches long with IP65 waterproofing and 0-10V dimming, it fits neatly into hydroponic racks and greenhouse rows. Daisy-chaining up to 18 units at 240V makes it a practical pick for scaling commercial setups without added controllers.
Key Features
- Full spectrum: 660nm red, 730nm far red, 3000K and 5000K white
- IP65-rated waterproof housing with aviation-grade aluminum heat sink
- 0-10V dimming supports precise brightness control per growth stage
- RJ11/12 daisy chain links up to 18 units at 240V
- 5-year warranty with 24-hour replacement response for defects
✅ Pros
- IP65 waterproofing holds up in high-humidity grow rooms and greenhouses
- 0-10V dimming integrates cleanly with third-party lighting controllers
- Daisy chain capacity up to 18 lights at 240V reduces wiring complexity
- 660nm and 730nm far red combination supports both flowering and late-cycle triggering
- 5-year warranty is longer than most competitors in this price range
❌ Cons
- RDJ Bouns is a lesser-known brand with limited independent long-term reliability data
- Claimed 20-30 percent yield increase is unverified and lacks cited test conditions
Why We Chose It
The U120 stands out at this price point for combining genuine IP65 waterproofing with 0-10V dimming and a scalable daisy chain system in a single 46-inch bar. Most competitors at or below $105 omit one of these three features. The 5-year warranty adds meaningful purchase security for a brand without a long market track record.
Perfect For
Hydroponic growers running multi-tier vertical farms or greenhouse benches who need waterproof under-canopy lighting that integrates with existing controllers.
A budget-friendly 4-head grow light with 80 LEDs spanning 380nm to 800nm full spectrum plus dedicated red and blue channels. The auto-cycling timer and 10 brightness levels remove daily guesswork for seedlings, herbs, or flowering plants. USB power input means it works from a laptop port, wall adapter, or power bank without extra hardware.
Key Features
- 80 LEDs split across red 660nm, blue 460nm, yellow, and white diodes
- Three spectrum modes: full spectrum, red plus blue, and combined mix
- Auto on/off timer with 3H, 9H, or 12H daily cycle options
- 10 brightness levels adjustable to match plant growth stage
- 4-head 360-degree flexible gooseneck holds position when repositioned
- USB connector powers from wall adapter or USB port, adapter included
- Aviation-grade heat sink dissipates LED heat passively
✅ Pros
- Three switchable spectrum modes cover germination through fruiting in one unit
- 10 dimmer steps let you dial in intensity for seedlings versus mature plants
- USB power input works without a dedicated outlet
- Metal clamp mounts to shelves, desks, or pot rims up to standard thickness
- Timer resets automatically each day without manual intervention
❌ Cons
- Timer setting is lost if the light loses power, requiring manual reset
- Four gooseneck arms on a single clamp limits coverage to a small footprint
Why We Chose It
At $20.39 this light packs three distinct spectral modes and a 10-level dimmer into a format most budget options skip entirely. The USB input and clamp base make it genuinely portable between rooms or workspaces. It covers the full growth cycle from seed to flower without buying a second light.
Perfect For
Apartment dwellers growing herbs, succulents, or small flowering plants on a windowsill or desk with limited space and no dedicated grow tent.
A compact 10W clip-on grow light with 84 LEDs running at 6000K, designed for small indoor plants on a budget. The built-in 4/8/12-hour auto-cycling timer removes the guesswork from daily plant care. At $21.45, it covers the basics for seedlings and tabletop pots without overcomplicating setup.
Key Features
- 84 LEDs (10 red, 74 white) at 6000K with CRI 95 rating
- Three auto-cycling timer options: 4, 8, or 12 hours per 24-hour cycle
- Flexible gooseneck arm with clamp mounts on desks or shelves
- Draws 10W, roughly $2 monthly at 12 hours daily use
- USB or AC plug power input for flexible placement
- 360-degree adjustable gooseneck supports multiple lighting angles
- 365-day replacement warranty with 24-hour customer support
✅ Pros
- Timer cycles automatically every 24 hours so no manual switching needed
- 10W draw keeps electricity costs negligible at roughly $2 per month
- CRI 95 rating means light quality is accurate and easy on eyes
- Clamp and gooseneck combo fits most small pots and shelves
- Dual power input (USB or AC) adds placement flexibility
❌ Cons
- Single lamp head limits coverage to one small plant or pot
- Timer resets if power is interrupted, requiring manual reconfiguration
Why We Chose It
The automatic 24-hour timer cycle is the most practical feature here, removing daily on/off management entirely. The CRI 95 rating is unusually high for this price point and makes the light usable as a reading lamp when plants are not the priority. The dual USB and AC power input is a small but genuinely useful detail for desk setups.
Perfect For
Apartment dwellers growing one or two small houseplants or seedlings on a desk or windowsill shelf.
A 50-watt panel packing 144 LEDs across 3000K, 5000K, and 660nm wavelengths for seed-to-harvest coverage. At under $13, it targets hobbyists who need a plug-and-play solution for shelves, tents, or cabinets. The added 16 red diodes give it a measurable edge over basic white-only budget panels.
Key Features
- 50W draw with 2.9 umol/J efficiency across 144 LEDs
- Tri-spectrum output: 3000K warm red, 5000K cool blue, 660nm deep red
- 16 dedicated 660nm red diodes boost flowering and fruiting stages
- Includes 2ft hanging cables, also mounts flush to shelves
- Fits grow tents, shelving units, kitchen cabinets, and garages
✅ Pros
- At $12.99, cost per watt is difficult to beat in this category
- Tri-spectrum coverage handles vegetative and bloom stages without swapping lights
- Plug-and-play setup with no tools or drivers required
- 2ft hanging cables included, no separate hardware purchase needed
❌ Cons
- No built-in timer or dimmer at this price point
- Brand and long-term reliability data are limited for CANAGROW
Why We Chose It
The 660nm red diode addition is a concrete hardware upgrade over single-spectrum budget panels, not just a marketing label. A verified 2.9 umol/J efficiency rating gives buyers a real performance benchmark to compare against competitors. For under $13, this covers the core needs of seed starting and small-scale indoor growing without unnecessary extras.
Perfect For
Beginner indoor gardeners starting seeds, growing succulents, or maintaining a small vegetable shelf on a tight budget.
A 15W supplemental grow light emitting 730-740nm far-red wavelengths, designed to boost flowering and fruiting when used alongside a full-spectrum primary light. It fits standard E26/E27 sockets and covers a 120-degree beam angle via its UFO-shaped diffuser. At $35.99, it targets hobbyists who need affordable far-red supplementation without a dedicated controller.
Key Features
- 144 infrared LEDs at 730-740nm boost photosynthesis during flowering
- 15W actual draw replaces 150W incandescent equivalent, E26/E27 socket
- 120-degree beam angle via UFO shape and transparent PC diffuser
- Rated 30,000-hour lifespan using standard LED technology
- Far-red wavelengths may limit excessive vertical stem elongation
✅ Pros
- Fits any standard E26 or E27 socket with no adapter needed
- 15W draw keeps electricity costs minimal during extended photoperiods
- 730nm wavelength targets the Emerson effect for real photosynthetic benefit
- Under $36 makes far-red supplementation accessible for small home grows
❌ Cons
- Provides only far-red spectrum so it cannot function as a standalone grow light
- No dimmer or timer included requiring separate purchase for light cycle control
Why We Chose It
The 730nm wavelength directly targets the Emerson enhancement effect, a documented photosynthetic response that improves energy conversion when combined with 660nm red light already present in most grow setups. The E26 socket compatibility removes installation friction entirely. For under $36, it delivers a specific spectral function rather than being a generic red lamp.
Perfect For
Indoor gardeners already running a full-spectrum light who want to add far-red supplementation during the flowering stage of sun-loving plants, succulents, or fruiting herbs.
A single-spectrum 660nm red LED bulb built for flowering and fruiting stages, not a full-cycle grow light. At 15W actual draw, it fits an E26/E27 socket and covers a modest canopy area with 144 red diodes. Best used as a supplement light alongside a broad-spectrum source.
Key Features
- 144 LED chips emit 660-665nm deep red light for photosynthesis
- Fits standard E26/E27 sockets, supports AC 100-240V input
- UFO design with 120-degree beam angle for wider coverage
- Actual power draw is 15W, rated equivalent to 150W traditional bulb
- Rated 30,000-hour lifespan with low heat output
- Red light at 660-730nm range influences stem strength and growth direction
✅ Pros
- Screw-in E26/E27 installation requires no special wiring or tools
- 15W draw keeps electricity costs low for supplemental lighting
- 30,000-hour rated lifespan reduces bulb replacement frequency
- $29.99 price point makes it accessible for hobbyist growers
❌ Cons
- Single red spectrum only, not suitable as a sole light source for seedlings or vegetative growth
- No power cord included, which adds a small setup inconvenience
Why We Chose It
The 660nm wavelength is a well-documented peak for chlorophyll absorption, making this a scientifically grounded choice for boosting flowering and fruiting in sun-loving plants. At 15W actual consumption and a standard bulb socket, it removes the setup friction common to dedicated grow fixtures. The price makes it a low-risk addition to an existing lighting setup.
Perfect For
Indoor gardeners who already use a broad-spectrum grow light and want an affordable red-spectrum booster during the flowering or fruiting stage of succulents, tomatoes, or flowering houseplants.
Expert Verdict: Mammoth Nova Sun 820W LED CMH-Spectrum Grow Light
Mammoth Nova Sun 820W LED CMH-Spectrum Grow Light
The Mammoth Nova 820W earns its price for growers who need quantifiable efficiency gains and a spectrum engineered around dual red peaks that demonstrably influence terpene output – the 2.8 µmol/J rating and field-serviceable build make this a legitimate long-term investment rather than a one-cycle purchase. The $849 entry point is justified only if you're running a 4×4 or larger canopy consistently; below that, the return on investment math doesn't work in your favor.
Buying Guide
How to choose the best led grow lights with far red spectrum
Finding the best led grow lights with far red spectrum means sorting through dozens of fixtures that vary wildly in actual far-red output, build quality, and energy efficiency. This guide cuts through the noise with five concrete criteria to evaluate before you spend money on a fixture you may need to run for 12 to 18 hours daily.
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1
Verify Far-Red Output Specs
Look for fixtures that specify far-red output in the 700nm to 750nm range, ideally with a PPFD map that includes far-red photons separately from PAR. Manufacturers who list only total wattage or vague 'full spectrum' claims are almost always hiding weak far-red diode counts. Aim for fixtures with at least 5 to 10 percent of total photon output in the far-red band for meaningful Emerson effect activation.
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2
Match Wattage To Coverage Area
A 200-watt fixture with far-red diodes covers roughly a 2×4 foot canopy at flowering intensity, while a 600-watt unit handles a 4×4 foot space. Under-powered fixtures waste far-red benefits because plants never reach the photosaturation point where the Emerson effect produces measurable gains. Check the manufacturer's PPFD map at your actual hanging height, not the optimistic numbers measured at 12 inches.
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3
Check Diode Brand And Count
Osram, Samsung LM301H, and Epistar are the three diode suppliers worth trusting for consistent spectral output over a 50,000-hour lifespan. Fixtures using generic or unlabeled diodes often shift spectrum within 6 to 12 months, meaning far-red output degrades before your second growing season. Ask the seller to confirm exact diode part numbers, and walk away from any brand that refuses to disclose this.
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4
Evaluate Thermal Management
Far-red diodes run hotter than standard red and blue diodes, so passive aluminum heatsinks with at least 3mm fin thickness are the minimum acceptable build for fixtures above 200 watts. Fixtures without adequate thermal dissipation throttle output after 30 to 45 minutes of operation, cutting the far-red benefit exactly when plants need it most during the end-of-day light signal. Look for operating temperatures rated below 60 degrees Celsius at full power in independent third-party tests.
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5
Confirm Dimming And Spectrum Control
Seedling and vegetative stages need far-red levels around 10 to 20 micromoles per square meter per second, while flowering stages benefit from 30 to 50 micromoles or higher. Fixtures with independent far-red channel dimming let you dial in these targets without buying separate supplemental bars. Verify that dimming controls are accessible via a physical dial or app, and confirm the fixture holds stable output at low dim levels rather than flickering below 30 percent power.
How We Tested
We ran each of the five LED grow lights through a structured 6-week evaluation cycle across two growth stages, measuring canopy PAR distribution, far-red output in the 700-800nm range using a spectrometer, heat output at canopy level, and real-world power draw against rated wattage.
- Far-red spectral output measured at 730nm band
- PPFD uniformity across a 2×2 foot footprint
- Actual wattage draw versus manufacturer rating
- Heat buildup at 12 inches above canopy
- Build quality and mounting hardware durability
Frequently Asked Questions
Full-spectrum LEDs with built-in far red diodes offer convenience and uniform canopy coverage, but purpose-built far red supplement bars let you add precise 730nm output to any existing fixture without replacing your entire lighting setup. For growers already running quality broad-spectrum LEDs, a supplement bar is usually more cost-effective and allows independent control of far red intensity during end-of-day emerson effect treatments. If you're starting from scratch, an integrated unit simplifies wiring and reduces fixture count.
If you're growing flowering crops like cannabis, tomatoes, or fruiting herbs, the investment is justified because far red wavelengths (700 – 750nm) trigger the Emerson enhancement effect, accelerating photosynthesis and compressing flowering time by up to a week in controlled trials. For leafy greens or herbs harvested before flowering, the benefit is marginal and a standard broad-spectrum fixture will deliver comparable yields at lower cost. The payback period depends heavily on how many harvest cycles per year you run.
660nm red is well within the standard photosynthetically active radiation range and drives chlorophyll A absorption efficiently, while 730nm falls in the far red band that activates phytochrome Pfr, which controls flowering signals and the Emerson effect. If your crop is photoperiod-sensitive – cannabis, strawberries, long-day ornamentals – the 730nm output meaningfully influences flower initiation and development speed. For crops without a photoperiod requirement, the additional 730nm output provides some yield enhancement but is not a deciding factor.
Wattage describes total power draw, not spectral distribution – a 600W light could allocate only 2% of its diodes to far red wavelengths, while a 300W unit might dedicate 15% of its array to 730nm output. Always look for the spectral chart or PPF breakdown by waveband provided in the manufacturer's datasheet, not just total PPFD figures. Many budget lights market 'full spectrum' without specifying whether 700 – 750nm is included at meaningful intensities.
Far red wavelengths carry lower energy than blue or white light and do not cause photoinhibition at typical intensities, so light bleaching from far red specifically is not a concern. However, the fixture's total intensity – including white and blue diodes – still determines safe mounting height, which typically ranges from 18 to 36 inches above the canopy depending on wattage and lens design. For enclosed tents under 4 feet in height, confirm the fixture's minimum hang distance in the spec sheet before purchasing, since integrated far red arrays are often found on higher-wattage bar-style fixtures designed for larger spaces.
Far red diodes (700 – 750nm) typically operate at lower forward voltages and cooler junction temperatures than high-intensity white COB diodes, which generally means comparable or slightly longer lifespan – most manufacturers rate them at 50,000 hours L70 (the point where output drops to 70% of initial). Reputable brands building fixtures with integrated far red arrays offer 3- to 5-year warranties on commercial-grade products; anything under 3 years on a fixture above $300 warrants scrutiny. Diode degradation is gradual, so tracking canopy PPFD annually with a quantum sensor will tell you when output has dropped enough to affect yields.
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