4 Inch 40W Industrial LED Work Light EMC CISPR 25 CLASS 4 Version 2
The SLL-4407 is a 4 inch industrial LED work light designed for heavy machinery operating in extreme conditions, where electrical noise, vibration, and environmental exposure can disrupt lighting performance. Four 10W Osram LEDs deliver 3,100 effective lumens in a flood beam pattern, providing even illumination across the work zone without hot spots. The die-cast aluminium housing with UV-resistant polyester powder coating and IP68 sealing ensures long-term durability in dust, water, and salt environments. The lamp is EMC tested to CISPR 25 Class 4, which prevents interference with vehicle electronics during operation.
- EMC CISPR 25 Class 4 compliance prevents electrical interference with vehicle control systems
- IP68 sealing and a durable polycarbonate lens resist water, dust, and impact in harsh environments
- 4x 10W Osram LEDs deliver 3,100 effective lumens with a 6000K colour temperature for clear visibility
- Overvoltage and overheat protection extend service life under unstable power conditions
- 9 to 32V DC operation allows use across 12V and 24V industrial systems without voltage conversion
Where This Lamp Is Used
- Front and side work lighting on excavators and cranes operating in wet or dusty conditions
- Cab and deck lighting on utility trucks and service vehicles used in remote or off-grid locations
- Auxiliary lighting on forklifts and engineering vehicles where electrical noise from motors affects electronics
- Night shift lighting on mining machinery exposed to vibration and temperature extremes
- Lighting on vessels and boats where salt spray and moisture degrade standard sealed lamps
Who It Is For
- Machinery OEMs integrating lighting into production line builds with consistent electrical performance
- Fleet operators replacing halogen lights that fail due to voltage spikes and heat
- Distributors sourcing industrial-grade LED lights with proven EMC compliance for resale
- Equipment dealers fitting lights on machines that must pass vehicle electronics certification
- 4x4 and industrial accessory brands developing private label work lights for rugged use
Problems It Solves
- Standard LED work lights cause electromagnetic interference that disrupts vehicle sensors and control units
- Cheaply built lights fail under vibration or moisture exposure, leading to frequent replacements
- Halogen lamps draw more current, overheat, and have short lifespans in continuous duty
- Lamps without overvoltage protection are damaged by alternator surges during engine start
- Non-EMC tested lights are rejected during vehicle certification or fail roadside inspections
- Painted metal housings degrade under UV and salt exposure, leading to corrosion and failure
Technical Features
- Four 10W Osram LEDs with a total real power draw of 40W and 3,100 effective lumens
- Flood beam pattern with even light distribution across the work area
- Semi-gloss black UV-resistant polyester powder coating on the full housing
- Overvoltage protection circuit and overheat protection to prevent damage during electrical faults
- 9 to 32V DC input range supports both 12V and 24V vehicle systems without modification
- Operating temperature range of -40 to +85 degrees Celsius for use in extreme climates
- IP68 sealing with a sealed cable entry gland to prevent water and dust ingress
- Bare wire lead of 40cm as standard, with connector options available on request
Technical Specification
Values taken from the original factory specification for this model. Fields the factory sheet does not state are left out rather than estimated.
| Part Number | SLL-4407 |
|---|---|
| Max Power | 40W |
| Real Power | 40W |
| LED | 4 pcs x 10W Osram |
| Effective Lumen | 3,100 lm |
| Beam Pattern | Flood |
| Colour Temperature | 6000K |
| Operating Voltage | 9 – 32V DC |
| Operating Temperature | -40 to +85 degrees Celsius |
| Waterproof Rating | IP68 |
| Electrical Protection | Overvoltage, Overheat |
| EMC Standard | CISPR 25 Class 4 |
| Lifespan | More than 50,000 hours |
| Lens Material | Anti-UV polycarbonate |
| Cable Length | 40cm bare wire standard |
Materials Used
- Anti-UV, durable polycarbonate lens
- Semi-gloss black UV-resistant polyester powder coating
- Silicone rubber gasket and sealed cable entry gland
How This Lamp Is Built
Die casting of the aluminium housing and heat sink
Powder coating with UV-resistant polyester finish
LED board assembly using Osram emitters
Lens bonding and gasket sealing
Quality Control on This Model
- Photometric output verified in an integrating sphere
- Sealing verified against the IP68 rating before shipment
- Vibration testing on a vibration test machine to simulate machine-mounted service
- Salt spray corrosion testing on housing coating and mounting bracket
- High and low temperature alternating humidity testing across the -40 to +85 degrees Celsius range
- EMC testing to CISPR 25 Class 4 in a shielded chamber
Customisation Options
- Deutsch DT connector instead of the standard 40cm bare wire lead
- Alternative cable length to match a specific machine harness
- Private label logo on the housing and printed carton
- Spot beam optics in place of the flood pattern
- Mixed cartons combining this lamp with other SUNLITEC models for trial orders
How It Compares With the Alternatives
| Standard LED work light without EMC testing | This lamp meets CISPR 25 Class 4, so it will not disrupt vehicle electronics during operation |
|---|---|
| Round 4 inch work lamp | The square body provides more LED surface area in the same footprint but requires a flat mounting surface |
| Flood beam version of the same lamp | Flood spreads light evenly across the near work zone, while spot reaches further but leaves edges dark |
| Larger 6 inch work lamp | Lower output but fits in tight spaces like cab pillars and guard rails where a 6 inch body cannot clear |
How to Fit and Use It
- Wire through a fused feed sized for 40W at 12V or 24V and keep the cable entry pointing downward
- Leave a drip loop in the 40cm lead to prevent water from entering the gland
- Aim the flood beam at the immediate work area and use a spot lamp separately for long-distance visibility
- Clean the polycarbonate lens with water and a soft cloth only—avoid solvents that may damage the anti-UV coating
Questions About This Model
Can I order a sample before placing a bulk order
Yes. Sample orders are welcome and mixed samples of different models in one shipment are accepted.
What is the lead time
Sample orders normally take around 3 to 7 working days. Bulk lead time depends on the model and the quantity ordered.
Do you have a minimum order quantity
There is an MOQ for standard orders, but smaller orders are also accepted, which suits distributors testing a new model.
How is the lamp shipped
Samples usually go by DHL, UPS, FedEx or TNT in around 4 to 7 days. Bulk orders ship by air in about 7 to 15 days or by sea in about 15 to 30 days.
Will this lamp work on both 12V and 24V machines
Yes. The operating range is 9 to 32V DC, so the same part number can be fitted to 12V and 24V vehicles.
Can you supply the lamp with our own brand
Yes. OEM and ODM service is available, including a private label logo on the housing and printed cartons.
Is it approved for use in vehicles with sensitive electronics
Yes. The lamp is tested to CISPR 25 Class 4 for electromagnetic compatibility, preventing interference with vehicle control systems.
Get a Price on 4 Inch 40W Industrial LED Work Light EMC CISPR 2
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