The 4-Inch Round White LED Auxiliary & Utility Light provides a compact lighting solution for trucks, trailers, commercial vehicles, and equipment using the popular 4-inch round lamp format.
Featuring 10 white LED diodes, a hardwired connection, and grommet-mount installation, this light is designed primarily for auxiliary and utility illumination rather than being limited to a single vehicle signal function.
I found the exact Kaper II 4-inch auxiliary-light family: Kaper II lists a 10-diode white auxiliary lamp with grommet mounting and a hardwired 3-way plug, along with PMMA lens, ABS housing, and FMVSS AUX designation.
10 White LED Diodes
The 10-diode LED configuration provides white illumination for compatible utility and auxiliary-lighting applications.
LED technology provides:
- Instant illumination
- Low power consumption
- Long-life LED technology
- Reduced maintenance
- Efficient illumination compared with traditional incandescent designs
Auxiliary & Utility Lighting
This product is specifically suited to auxiliary and utility-light applications.
Potential uses include:
- Work-area illumination
- Trailer utility lighting
- Service-body lighting
- Equipment lighting
- Rear auxiliary lighting
- Cargo-area exterior lighting
- Supplemental vehicle lighting
An important distinction is that auxiliary/utility and backup lamps are not automatically interchangeable from a regulatory standpoint, even when they look nearly identical. Optronics, for example, sells a similar 4-inch 10-diode white lamp specifically as a utility/work light rather than a certified backup lamp.
4-Inch Round Format
The 4-inch round format is widely used throughout truck and trailer lighting.
This makes the light a strong candidate for replacement applications where customers recognize the physical size and shape but may not know the original part number.
Hardwired Connection
This light features a hardwired electrical connection rather than relying on a conventional removable standard lamp plug.
Kaper II's exact 10-diode grommet-mount auxiliary lamp is specified with a hardwired 3-way plug.
Grommet-Mount Installation
The grommet-mount design allows the lamp to sit recessed within a compatible mounting opening.
This creates the familiar clean, low-profile appearance commonly found with 4-inch round commercial vehicle lights.
The mounting grommet should not be assumed to be included unless this particular product is packaged as a kit.
Specifications
| Specification | Details |
|---|
| Product Type | LED Auxiliary / Utility Light |
| Light Shape | Round |
| Nominal Size | 4 Inch |
| Illumination Color | White |
| Lighting Technology | LED |
| LED Count | 10 Diodes |
| Primary Function | Auxiliary / Utility Lighting |
| Mounting Style | Grommet Mount |
| Connection | Hardwired |
| Exact Kaper II Connection | Hardwired 3-Way Plug |
| Lens Material | PMMA |
| Housing Material | ABS |
| FMVSS Designation | AUX |
The additional construction and connection specifications above are verified against Kaper II's exact 10-diode 4-inch auxiliary-lamp listing.
Features
- 4-inch round light format
- 10 white LED diodes
- Auxiliary and utility-light function
- Grommet-mount installation
- Hardwired 3-way plug
- PMMA lens
- ABS housing
- FMVSS AUX designation
- Recessed, low-profile installation
- Instant LED illumination
- Low power consumption
- Long-life LED technology
- Reduced maintenance
- Suitable for compatible replacement and custom lighting installations
Applications & Compatibility
This 4-Inch Round White LED Auxiliary Light can be considered for compatible:
- Semi trucks
- Heavy-duty trucks
- Commercial trucks
- Work trucks
- Service trucks
- Utility trucks
- Cargo trailers
- Utility trailers
- Equipment trailers
- Flatbed trailers
- Enclosed trailers
- Horse trailers
- RVs and motorhomes
- Fifth wheels
- Fleet vehicles
- Agricultural equipment
- Construction equipment
- Industrial equipment
- Specialty vehicles
Auxiliary Light vs. Backup Light
This distinction is worth emphasizing on the product page.
Auxiliary / Utility Light: Designed to provide supplemental illumination where needed.
Backup / Reverse Light: Specifically intended and certified for use as part of the vehicle's required reverse-light system.
Although a white 4-inch utility light can physically resemble a backup lamp, customers should not assume that every auxiliary light is approved as a required backup lamp. A similar Optronics 10-diode utility lamp is explicitly identified as a work light rather than a certified backup lamp.
Important Fitment Note
Before ordering, verify:
- 4-inch round light format
- 10-diode configuration
- White illumination
- Auxiliary/utility-light function
- Grommet-mount configuration
- Required mounting opening
- Hardwired 3-way plug compatibility
- Vehicle voltage
- Available mounting depth
- Wiring clearance
The exact voltage, amperage, overall dimensions, grommet inclusion, wire/lead length, IP rating, and mounting-opening dimensions should be confirmed for this specific light rather than assumed from similar 4-inch utility lamps.
Marketing Callout
10 WHITE LEDs. 4-INCH ROUND FORMAT. BUILT FOR AUXILIARY & UTILITY LIGHTING.
A versatile recessed LED utility light for compatible truck, trailer, RV, fleet, and equipment applications.
