R4 120–277V High-Power Grow Light Driver
FAHOLD R4 120–277V high-power grow light drivers are non-isolated single-channel constant-current power solutions for commercial horticulture fixtures, LED bar lights and professional indoor grow lighting. The series provides a slim programmable platform with 210–360Vdc output for high-voltage LED-string architectures.
Current R4 models include 400W, 600W, 800W and 1000W power classes with output-current capability from approximately 1.05A to 4.20A depending on model. Compatible Type B configurations support offline programming, 0–10V / PWM / resistor dimming, Dim-to-Off and soft-start, while all current models use an IP65 enclosure platform.
Compare the four models below by wattage, LED voltage window, output current and control requirements. FAHOLD also supports electrical matching, programmable-output configuration, datasheets, samples and OEM/ODM commercial grow-light projects.
R4 120–277V High-Power Grow Light LED Drivers
FAHOLD R4 is a high-power non-isolated single-channel constant-current LED driver platform developed for commercial grow lights, LED bar fixtures and professional horticulture luminaires. This product group uses 120–277Vac rated input and a 210–360Vdc LED output window, with current models covering 400W, 600W, 800W and 1000W.
The R4 platform is designed for grow-light manufacturers that need high power density, a slim mechanical format, programmable output and flexible control from one driver family. The correct model should be selected according to the LED board's complete forward-voltage range, required output current, maximum fixture power and control requirements rather than wattage alone.
Compare R4 400W, 600W, 800W and 1000W Models
All four R4 120–277Vac models use the same 210–360Vdc output-voltage platform but provide different full-power current capability and maximum output wattage.
| Power Class | Rated Input | Output Voltage | Full-Power Output Current | Typical Efficiency |
|---|---|---|---|---|
| 400W | 120–277Vac | 210–360Vdc | 1.05–1.90A | 96.0% |
| 600W | 120–277Vac | 210–360Vdc | 1.40–2.80A | 96.0% |
| 800W | 120–277Vac | 210–360Vdc | 1.70–3.40A | 96.5% |
| 1000W | 120–277Vac | 210–360Vdc | 2.10–4.20A | 97.0% |
The LED operating voltage and required current must both remain inside the electrical limits of the selected model. A driver whose maximum wattage appears sufficient can still be unsuitable if the LED string voltage or current falls outside the supported range.
120–277Vac Grow Light Drivers for Commercial Horticulture
The R4 platform uses a 120–277Vac rated input range, making it suitable for compatible commercial horticulture systems using common North American lighting and building supply voltages such as 120Vac, 208Vac, 240Vac and 277Vac.
This broad input range can help fixture manufacturers standardize one grow-light power platform across several project environments without moving to a separate high-voltage 347V / 480V driver architecture.
For facilities specifically using higher-voltage 347V or 480V-class distribution, compare the
R4-V 200–480Vac High-Power Grow Light Drivers
.
210–360Vdc Constant-Current Output for High-Voltage LED Strings
All current R4 120–277Vac models use a 210–360Vdc constant-current output platform. This makes the series suitable for horticulture LED-board architectures that use longer high-voltage LED strings rather than low-voltage, very-high-current outputs.
A higher LED-string voltage allows substantial fixture power to be delivered with lower DC current than a comparable 40V–60V LED-board architecture. This can influence cable sizing, PCB layout, connector requirements and thermal behavior inside the luminaire.
Because R4 is non-isolated, the high-voltage LED output must be considered as part of the complete fixture safety architecture. Accessible components, PCB insulation, wiring, connectors, enclosure construction and target-market certification all need to be evaluated together.
400W R4 Grow Light LED Driver
The 400W R4 model provides 210–360Vdc output with approximately 1.05–1.90A full-power current capability. It is the lowest-power product in the current 120–277Vac R4 group and is relevant to medium-power commercial grow lights, horticulture LED bars and slim fixture architectures using a high-voltage LED string.
Its compact linear enclosure also makes the 400W platform useful where fixture space is restricted but a programmable high-power driver is still required.
600W R4 Grow Light LED Driver
The 600W R4 model extends the same 210–360Vdc architecture to approximately 1.40–2.80A full-power current. This power class is suitable for commercial horticulture fixtures that require more LED output while retaining the same 120–277Vac facility compatibility.
For OEM fixture families, programmable output allows supported operating parameters to be configured within the electrical limits of the driver rather than designing every fixture around one fixed current point.
800W R4 Programmable Grow Light Driver
The 800W R4 model provides approximately 1.70–3.40A across the 210–360Vdc output window and reaches approximately 96.5% typical efficiency.
This power level is particularly relevant to high-output indoor grow lights and commercial LED bar systems where efficiency, slim mechanical integration and centralized dimming are important design requirements.
1000W R4 High-Efficiency Grow Light Driver
The 1000W R4 model is the highest-power product in the current 120–277Vac branch. It provides approximately 2.10–4.20A across the 210–360Vdc output range and reaches approximately 97% typical efficiency.
At the 1kW power level, driver efficiency becomes increasingly important because even small conversion losses create additional heat that must be managed by the grow-light fixture and cultivation facility.
Output wiring, LED-board current paths, driver mounting and fixture thermal management should all be reviewed as part of the complete 1000W system design.
Programmable Grow Light Driver Output
R4 supports offline programmable output. Supported electrical parameters can be configured within the operating limits of the selected driver to match different LED-board current requirements, fixture wattages or OEM product variants.
Programmability can help grow-light manufacturers use one driver platform across several fixture SKUs. For example, a product family may share the same mechanical and electrical architecture while using different programmed operating points for different commercial wattage targets.
The final programmed current and power must remain inside the permitted voltage, current, thermal and maximum-power limits of the selected R4 model.
0–10V Dimmable Grow Light Drivers
Compatible R4 Type B configurations support 0–10V dimming for commercial horticulture lighting-control systems. This allows fixture output to respond to crop-development stages, cultivation schedules, daylight strategies and centralized environmental control.
The controller signal range, control wiring and actual system compatibility should be confirmed before final production because 0–10V implementations can differ between lighting-control products.
PWM and Resistor Dimming Options
Type B R4 configurations also support PWM and resistor-based control as part of the platform's 3-in-1 dimming architecture.
| Control Method | Typical Use | Selection Consideration |
|---|---|---|
| 0–10V | Commercial greenhouse and indoor-grow controllers | Confirm signal range and control wiring. |
| PWM | Fixture controllers and horticulture automation systems | Verify signal level, frequency and driver compatibility. |
| Resistor / Rx | External resistance-based output adjustment | Confirm the supported resistance range and interface requirements. |
Type N configurations are available when external dimming is not required. The required control type should therefore be defined before samples or production units are ordered.
Dim-to-Off for Horticulture Lighting Schedules
Compatible R4 Type B configurations support Dim-to-Off operation. This allows the LED output to shut down completely at the lower control threshold instead of leaving visible residual light.
A true off state can be important in controlled-environment agriculture when crop schedules require defined dark periods. The controller, driver and LED load should still be validated together when precise low-end behavior is required.
Soft-Start for High-Power Grow-Light Fixtures
R4 also supports soft-start operation on compatible configurations. Soft-start provides controlled output turn-on rather than applying the final operating condition instantaneously.
This function can support predictable startup behavior in commercial high-power lighting systems and should be evaluated together with the fixture controller and facility electrical architecture.
Type B vs Type N R4 Configurations
| Configuration | Control Capability | Typical Project |
|---|---|---|
| Type B | Programmable + 0–10V / PWM / resistor 3-in-1 dimming | Commercial horticulture fixtures requiring adjustable output and external control |
| Type N | Non-dimmable fixed-output configuration | Grow-light fixtures where external intensity control is not required |
Specify the required control configuration during product selection. The R4 series name alone should not be used to assume that every supplied driver includes the same dimming functionality.
Optional RJ12 and Knob Dimming
R4 also provides an optional configuration with RJ12 interface and knob dimmer. This can support fixtures that require a convenient local adjustment interface together with external connection capability.
The RJ12 / knob configuration is optional and should be defined during model configuration rather than assumed to be included with every product.
Optional 12V Auxiliary Output
A 12V auxiliary-output configuration is also available for compatible R4 models. Auxiliary power can support suitable fixture electronics, sensors or control components without requiring a separate low-voltage supply.
The auxiliary configuration should be specified during product selection together with the required dimming and control architecture.
Slim High-Power LED Driver for Grow-Light Fixtures
One of the major mechanical advantages of R4 is its slim linear enclosure. Current 120–277Vac products provide several hundred watts to 1000W from an enclosure approximately 85–89mm wide and 41–45mm high, depending on power class.
This makes R4 relevant to long LED bar fixtures and commercial grow-light architectures where driver width and height must be controlled while still providing substantial output power.
Mechanical drawings should always be reviewed before fixture tooling or mounting points are finalized because driver length changes as power increases.
96–97% Typical Efficiency for Commercial Grow Lighting
Commercial grow lights frequently operate for long daily cycles, so power-conversion efficiency affects both facility electricity use and fixture thermal load.
Current R4 120–277Vac models are listed at approximately 96% typical efficiency for 400W and 600W, 96.5% for 800W and 97% for 1000W. Typical power factor is above 0.95 across all four models.
Real efficiency depends on AC input, LED operating voltage, output current and thermal conditions, so expected fixture operating points should be reviewed during product selection.
IP65 R4 Drivers for Commercial Horticulture
Current R4 products use an IP65 enclosure platform for professional grow-light, horticulture and high-power lighting applications.
IP65 applies to the driver enclosure itself and does not define the environmental rating of the complete luminaire. Connectors, cables, seals, fixture housing, mounting orientation and thermal design must also be suitable for the actual grow-room or greenhouse environment.
SCP, OVP and OTP Protection
R4 includes short-circuit protection, over-voltage protection and over-temperature protection to support high-power fixture integration.
These driver-level functions should be combined with correct facility grounding, branch-circuit protection, fixture insulation and thermal engineering as part of the complete horticulture lighting system.
R4 Applications in Commercial Grow Lighting
LED Bar Grow Lights
The slim linear enclosure, programmable output and 210–360Vdc LED-string architecture make R4 well suited to high-power commercial LED bar fixtures where driver installation space is limited.
Indoor Commercial Grow Rooms
R4 provides 400W to 1000W options for indoor horticulture fixtures operating from common 120–277Vac commercial electrical systems. Compatible dimming configurations allow fixtures to integrate with centralized lighting control.
Greenhouse Horticulture Fixtures
Commercial greenhouse luminaires that use a single high-voltage LED load can use the R4 platform when the 120–277Vac facility input and 210–360Vdc LED operating window match the driver specification.
How to Select the Right R4 120–277V Grow Light Driver
- Confirm the facility AC input.
Verify that the project supply falls within the 120–277Vac rated-input range. - Define the LED forward-voltage window.
Provide the minimum, nominal and maximum voltage of the horticulture LED load. - Confirm compatibility with 210–360Vdc.
The complete LED operating range must remain within the supported R4 output window. - Determine the required output current.
Compare the LED current requirement with the full-power current range of the 400W, 600W, 800W or 1000W model. - Select the power class.
Choose the driver according to the actual maximum LED electrical load rather than fixture marketing wattage alone. - Define the dimming requirement.
Specify Type B for compatible 0–10V / PWM / resistor dimming or Type N when fixed-output operation is required. - Define the programmed operating point.
If offline programming is required, specify the target current and power during product configuration. - Specify optional interfaces.
Confirm whether RJ12, local knob dimming or 12V auxiliary power is required. - Review environmental and thermal conditions.
Check IP65 integration, mounting location, operating temperature, airflow and fixture cooling. - Confirm safety and certification requirements.
Because R4 uses a non-isolated high-voltage output architecture, review the complete luminaire safety design and target-market compliance before final production approval.
R4 vs R4E vs R4-V Grow Light Drivers
R4, R4E and R4-V share the same broader non-isolated high-power platform and 210–360Vdc output architecture, but they serve different facility input requirements.
| Platform | Rated Input | Current Power Direction | Typical Selection Scenario |
|---|---|---|---|
| R4 | 120–277Vac | 400W / 600W / 800W / 1000W | Commercial grow-light projects requiring broad 120V–277V input compatibility |
| R4E | 200–277Vac | 500W–1200W | Higher-power projects specifically designed around 200V–277V facility infrastructure |
| R4-V | 200–480Vac | 400W–1200W | High-voltage commercial facilities using compatible 347V / 480V-class distribution |
For 200–277Vac projects, compare
R4E 200–277Vac High-Power Grow Light Drivers
.
For high-voltage facilities, compare
R4-V 200–480Vac High-Power Grow Light Drivers
.
R4 Grow Light Driver Manufacturer for OEM Fixtures
High-power horticulture fixture development requires accurate coordination between the LED board, driver and finished luminaire. LED voltage range, output current, programmed power, dimming method, auxiliary interfaces, mechanical space, thermal conditions and certification requirements can all affect the correct driver configuration.
FAHOLD supports R4 model matching, offline-programming evaluation, datasheets, samples and OEM/ODM commercial grow-light projects. For accurate pre-selection, provide the facility AC input, LED voltage range, required current, maximum fixture power, control protocol, optional-interface requirements, target certification and expected quantity.
For the broader product category, return to
Non-Isolated Single-Channel Grow Light Drivers
.
For complete R4 dimensions, model coding, control configurations and technical data, review the
R4 High-Power Non-Isolated Grow Light LED Driver Series
.
Frequently Asked Questions
What is the FAHOLD R4 120–277V grow light LED driver?
FAHOLD R4 is a high-power non-isolated single-channel constant-current LED driver platform for commercial grow-light and horticulture fixtures. The 120–277Vac range includes 400W, 600W, 800W and 1000W models using a 210–360Vdc LED output platform.
What wattages are available for R4 120–277V grow light drivers?
The current R4 120–277Vac product range includes 400W, 600W, 800W and 1000W models. Select the power class together with the LED voltage and required output current rather than wattage alone.
What output-voltage range does the R4 Series use?
All current R4 120–277Vac models use a 210–360Vdc constant-current output platform. The LED board's complete minimum-to-maximum forward-voltage range must remain within this operating window.
How much output current can R4 grow light drivers provide?
Current R4 models cover approximately 1.05–1.90A at 400W, 1.40–2.80A at 600W, 1.70–3.40A at 800W and 2.10–4.20A at 1000W. Final compatibility depends on both LED operating voltage and current.
Are R4 horticulture LED drivers programmable?
Yes. The R4 platform supports offline programmable output. Supported parameters can be configured within the electrical limits of the selected driver to match different LED-board current, fixture-power and OEM product requirements.
Does the R4 Series support 0–10V and PWM dimming?
Yes. Compatible R4 Type B configurations support 0–10V, PWM and resistor-based 3-in-1 dimming together with Dim-to-Off and soft-start. Type N non-dimming configurations are also available.
What is the difference between R4, R4E and R4-V grow light drivers?
R4 uses 120–277Vac input, R4E uses 200–277Vac input and R4-V uses 200–480Vac input. All three platforms use the broader R4 non-isolated architecture and a 210–360Vdc output range, but their available power classes and facility-voltage requirements differ.
How efficient are R4 grow light LED drivers?
Current 120–277Vac R4 models are listed at approximately 96% typical efficiency for 400W and 600W, 96.5% for 800W and 97% for 1000W. Typical power factor is above 0.95 across all four models.
Are R4 grow light drivers suitable for commercial greenhouse environments?
Current R4 models use an IP65 enclosure platform for professional horticulture and high-power lighting applications. Final greenhouse suitability also depends on connectors, cable sealing, fixture housing, mounting conditions, humidity, temperature and the complete luminaire design.
How do I choose between the 400W, 600W, 800W and 1000W R4 models?
Start with the LED board's minimum and maximum forward voltage and confirm that it fits within the 210–360Vdc output window. Then match the required current and maximum power to the appropriate R4 model, followed by dimming, programming, auxiliary-interface, IP and certification requirements.
