Horticultural lighting is the one LED category where the buyer’s own metric is not lumens. Plants do not respond to light the way the human eye does, so a specification written in lux, watts or “equivalent to a 1000W HPS” tells a grower almost nothing. The numbers that matter — PPF, PPE, PPFD and DLI — are simple enough, and the suppliers worth dealing with quote all four without being asked.
Key takeaways
- The efficacy metric is PPE in µmol/J, not lm/W. Commercial fixtures in 2026 run roughly 2.6 to 3.6 µmol/J; anything claiming far above that range deserves a test report.
- PPF (µmol/s) is what the fixture emits. PPFD (µmol/m²/s) is what reaches the canopy. DLI (mol/m²/day) is the daily total the crop actually receives — and DLI is what you design to.
- Uniformity across the canopy matters more than peak PPFD. A fixture with a high centre reading and weak edges produces uneven crops regardless of its headline numbers.
- 2026’s practical differentiators are 0–10V dimming and daisy-chaining as standard, and detachable remote drivers, which move roughly 10–15% of the heat out of the grow space and cut HVAC load.
- SINOCO manufactures commercial LED grow lights in China — bar fixtures and tube formats — with OEM and ODM programmes and spectrum configuration by crop.
The Four Numbers That Define a Grow Light
PPF — photosynthetic photon flux
PPF measures the total photons in the 400–700 nm photosynthetically active range that a fixture emits per second, in µmol/s. It describes the fixture, not the crop, and it is the closest horticultural analogue to a lumen output figure. The Gavita Pro 1700e LED, for example, is rated at 1700 µmol/s from 645 W.
PPE — photosynthetic photon efficacy
PPE is PPF divided by input power, in µmol/J. This is the efficiency figure and the one that drives operating cost. Published values across leading commercial fixtures in 2026:
| Fixture | Stated PPE | Notes |
|---|---|---|
| Fluence VYPR 4 | 2.7–3.6 µmol/J at 400V AC | Range varies by configuration; commercial cultivation platform |
| Gavita Pro RS 2400e | 3.2 µmol/J | High-efficiency commercial bar fixture |
| ROI-F720 | 2.9 µmol/J | Among the higher published figures in its class |
| Gavita Pro 1700e LED | 2.6 µmol/J | 645 W, 1700 µmol/s; widely deployed in licensed facilities |
| Fluence SPYDR series | Varies by model | Positioned for vertical farming and high-density racks |
Two caveats a buyer should apply to every figure in that table. First, PPE is voltage-dependent — many fixtures achieve their headline efficacy at 400V or 480V three-phase and fall short on 120V or 230V single-phase, which is why Fluence quotes the VYPR 4 range explicitly at 400V AC. Ask for the figure at your supply voltage. Second, PPE claims should be backed by a test report from an accredited photometric laboratory for the exact model, not a calculation.
PPFD — photosynthetic photon flux density
PPFD is what actually lands on the canopy, in µmol/m²/s, measured at a defined height across a defined grid. This is where most disappointing installations are exposed, because PPFD is a map, not a number. A single centre-point reading is close to meaningless.
Require a PPFD map: a grid of readings at your mounting height and fixture spacing, with the minimum, maximum and average stated, and ideally a min-to-average ratio. A fixture that reads 1,100 µmol/m²/s dead centre and 500 at the corners will produce visibly uneven growth, and no amount of headline PPE fixes that.
DLI — daily light integral
DLI is the total photon dose the crop receives in a day, in mol/m²/day, and it is the number you should actually be designing to. It follows directly from PPFD and photoperiod:
DLI (mol/m²/day) = PPFD (µmol/m²/s) × photoperiod (seconds) ÷ 1,000,000
Worked example: 800 µmol/m²/s × 12 h (43,200 s) ÷ 1,000,000 = 34.6 mol/m²/day
Different crops want very different DLI. Leafy greens and herbs are typically satisfied in the low-to-mid teens; fruiting and high-light crops want substantially more. Designing to a target DLI, then choosing PPFD and photoperiod to reach it, is a far more robust method than picking a fixture and hoping.
Spectrum: What Is Settled and What Is Marketing
Spectrum generates more marketing noise than any other aspect of horticultural lighting. What is reasonably settled:
- Red around 660 nm sits near the chlorophyll absorption peak and is the most photosynthetically efficient band per photon; it dominates the spectrum of most efficient commercial fixtures.
- Blue around 450 nm influences morphology — compactness, leaf thickness, stomatal behaviour — and is needed in some proportion, but is less efficient per photon than red.
- Broad white / full spectrum improves the working environment enormously, makes visual crop inspection possible, and is now standard on commercial fixtures for practical rather than purely photobiological reasons.
- Far-red (around 730 nm) affects extension growth and flowering timing through phytochrome, and is genuinely useful — but it sits outside the 400–700 nm PAR range used to calculate PPF, which means fixtures counting far-red in their photon figures are not comparable with those that do not. Ask explicitly.
Where claims should be treated sceptically: highly specific “crop recipes” presented as proprietary breakthroughs, UV channels sold as yield multipliers without trial data, and any spectrum claim unaccompanied by a spectral power distribution chart. Ask for the SPD. It takes a supplier thirty seconds to send and answers most questions immediately.
The 2026 Engineering Shifts Worth Specifying For
Detachable and remote drivers
The trend among high-power fixtures is a detachable driver that can be mounted away from the canopy. The reason is thermal: moving the driver out of the grow space removes roughly 10–15% of the fixture’s heat load from the conditioned volume, which directly reduces HVAC capacity and running cost. In a facility where dehumidification and cooling are among the largest operating expenses, that is a material line item — and it also makes driver replacement a task that does not require working over a live crop.
Dimming and control
Dimming stopped being a convenience feature. It is now a cost-control and crop-steering tool: reducing output during high-tariff periods, matching DLI to growth stage, and ramping at either end of the photoperiod. What to specify:
- 0–10V dimming as a minimum, with daisy-chaining so a run of fixtures is controlled as a zone.
- Wireless or networked control where the facility has a climate computer to integrate with; confirm the protocol rather than accepting “app controlled”.
- Zone granularity — how many fixtures per control channel, which determines how finely you can steer different rooms or tiers.
- Dimming linearity and minimum level, since some drivers behave poorly below 20%.
Certification and safety
Horticultural environments are wet, humid and often corrosive from fertigation. Two certifications matter specifically:
| Certification | What it covers | Why it matters |
|---|---|---|
| UL 8800 | Horticultural lighting equipment safety | The application-specific safety standard for grow environments; often required by insurers and AHJs |
| DLC Horticultural QPL | Performance listing — PPE, PPF, warranty, driver requirements | The gate to most North American utility rebates for horticultural lighting |
| IP65 / IP66 | Ingress protection | Wet-room washdown and fertigation exposure |
| CE / ENEC | European conformity | CE is self-declared; ENEC involves third-party testing |
The DLC Horticultural listing is worth checking early, because horticultural lighting rebates in some North American jurisdictions are large enough to change the capital case materially — and they almost always require the exact model to appear on the Qualified Products List.
The Supplier Landscape
| Tier | Representative names | Proposition |
|---|---|---|
| Commercial market leaders | Fluence (Signify), Gavita, Heliospectra, California Lightworks | Deployed at scale in licensed facilities, controller ecosystems, long warranties, extensive trial data |
| China OEM/ODM manufacturers | SINOCO and comparable ISO-certified factories | Direct factory pricing, spectrum and form-factor customisation, own tooling |
| Consumer and hobby brands | Spider Farmer, Mars Hydro and similar | Low cost, small-tent formats; not engineered for commercial duty cycles |
| Marketplace sellers | Unbranded listings | Lowest price; frequently no PPF test report, no PPFD map, no warranty path |
Gavita and Fluence dominate licensed commercial cultivation, and the reasons are instructive: reliability under continuous duty, controller integration capable of managing hundreds of fixtures as zones, and multi-year warranties. Gavita’s EL3 controller ecosystem is a significant part of why facilities standardise on it — the fixture is chosen partly for the control layer around it.
For a buyer evaluating a China OEM against those names, the questions are the same ones that apply in any lighting category: can you produce a third-party PPF and PPE test report for this exact model at my supply voltage; can you produce a PPFD map at my mounting height and spacing; what driver is in it and what is its rated life at operating temperature; and is the fixture listed to UL 8800 and on the DLC Horticultural QPL if my rebate case depends on it.
A Buying Sequence That Works
- Start with the crop’s target DLI, not with a fixture.
- Choose photoperiod, then solve for the PPFD you need at canopy.
- Set the layout — mounting height, fixture spacing, tier pitch — and require a PPFD map for that exact geometry.
- Compare PPE at your supply voltage, backed by a test report for the exact model.
- Check the spectrum against an SPD chart, and confirm whether far-red is included in the quoted PPF.
- Confirm certification — UL 8800, IP rating, DLC Horticultural listing if rebates apply.
- Assess the control layer — dimming protocol, zone granularity, integration with your climate system.
- Then compare total cost, including HVAC implications of driver placement, not fixture price alone.
Where SINOCO Fits
SINOCO manufactures LED grow lights in China in both bar and tube formats, with OEM and ODM programmes covering spectrum configuration, fixture geometry, driver selection and control integration.
For buyers working through supplier selection, our guides to choosing an LED grow light wholesale supplier in China, LED grow lights for indoor commercial farming and full-spectrum LED grow lights for indoor plants go deeper into each decision.
Planning a horticultural lighting installation? Send SINOCO your crop, target DLI, room geometry and supply voltage and we will return a layout with a PPFD map and PPE at your actual voltage — or browse the LED grow light range.
Frequently Asked Questions
What is a good PPE for a commercial LED grow light?
Commercial fixtures in 2026 generally publish between about 2.6 and 3.6 µmol/J. The Gavita Pro 1700e is rated at 2.6 µmol/J, the Gavita Pro RS 2400e at 3.2, and the Fluence VYPR 4 at 2.7 to 3.6 depending on configuration at 400V AC. Because efficacy is voltage-dependent, always ask for the figure at your actual supply voltage and require a test report for the exact model.
What is the difference between PPF, PPFD and DLI?
PPF is the total photons in the 400–700 nm range a fixture emits per second, measured in µmol/s — a property of the fixture. PPFD is the photon density arriving at the canopy in µmol/m²/s — a property of the installation. DLI is the total daily dose in mol/m²/day, calculated as PPFD multiplied by photoperiod in seconds divided by one million. Design to DLI.
How do I calculate DLI?
Multiply PPFD in µmol/m²/s by the photoperiod in seconds, then divide by 1,000,000. For example, 800 µmol/m²/s over a 12-hour photoperiod is 800 × 43,200 ÷ 1,000,000 = 34.6 mol/m²/day. Choose the target DLI from the crop, then pick the PPFD and photoperiod combination that reaches it.
Why does PPFD uniformity matter more than peak PPFD?
Because crops grow according to the light they individually receive, not the average of the room. A fixture reading 1,100 µmol/m²/s at centre and 500 at the edges produces visibly uneven growth and inconsistent harvest timing. Always ask for a PPFD map on a grid at your mounting height and spacing, with minimum, maximum and average values stated.
Is far-red counted in PPF?
It should not be, because PPF is defined over the 400–700 nm photosynthetically active range and far-red sits at around 730 nm. Some suppliers quote an extended photon figure that includes far-red, which makes their numbers non-comparable with fixtures that do not. Ask explicitly which range the quoted PPF covers before comparing two fixtures.
What is UL 8800?
UL 8800 is the safety standard specific to horticultural lighting equipment, covering the wet, humid and chemically exposed conditions of grow environments. It is frequently required by insurers and local authorities having jurisdiction for commercial cultivation facilities, and it is a different question from DLC Horticultural listing, which is a performance programme tied to utility rebates.
Why are detachable drivers becoming standard?
Because moving the driver out of the grow space removes roughly 10 to 15 percent of the fixture’s heat from the conditioned volume, which reduces HVAC capacity and running cost. In facilities where cooling and dehumidification are among the largest operating expenses, that is a meaningful saving, and it also allows driver replacement without working directly over a crop.
Can I use consumer grow lights in a commercial facility?
It is generally a poor economic decision. Consumer and hobby fixtures are designed for small tents and intermittent use rather than continuous commercial duty cycles, typically lack UL 8800 listing, rarely come with third-party PPF test reports or PPFD maps, and seldom offer the dimming and zone control a commercial facility needs. The failure and replacement rate usually erases the initial saving.
Conclusion
Horticultural lighting rewards buyers who insist on the right units. Ask for PPE at your supply voltage with a test report behind it, a PPFD map for your actual geometry, an SPD chart, and a clear answer on whether far-red is in the photon count. Those four documents separate suppliers who have measured their product from suppliers who have described it.
Beyond that, the 2026 decisions are about the system rather than the fixture: where the driver sits and what that does to your HVAC load, how finely you can dim and zone, and whether the control layer integrates with the climate system you already run. Those choices shape operating cost for the life of the facility far more than the difference between 2.9 and 3.1 µmol/J ever will.