1. Product Overview
The HELLA Marine 8504 Series Masthead/Floodlight Combination Deck Lamp integrates two essential marine lighting functions into a single, robust housing. Designed for vessels under 20 meters in length, this light provides both masthead navigation and deck floodlighting. Its construction features UV and impact-resistant plastic housing, ensuring durability in marine environments. The floodlight component utilizes 'Free Form' reflector technology for efficient illumination.
Key Features:
- Advanced materials and technology for reliability and efficiency.
- 'Free Form' reflector technology for optimal light distribution.
- Combines deck floodlight and masthead lamp functions.
- All metal components are stainless steel for corrosion resistance.
- UV and impact-resistant plastic housing for durability.
2. Important Safety Information
Read all instructions carefully before installation and operation. Failure to follow these instructions may result in product damage, property damage, or serious injury.
- Electrical Safety: Ensure the vessel's power supply is disconnected before performing any electrical work. Incorrect wiring can cause electrical shock or fire.
- Professional Installation: If you are unsure about any part of the installation process, consult a qualified marine electrician.
- Voltage: This product is designed for 12V DC systems only. Connecting to an incorrect voltage will damage the unit.
- Mounting: Securely mount the light to prevent detachment during vessel operation.
- Water Resistance: While the product is water-resistant, ensure all connections are properly sealed to maintain integrity in the marine environment.
3. Package Contents
Verify that all components are present before beginning installation:
- Hella 8504 Series Masthead/Floodlight Combination Light
- Bulb (pre-installed or included separately)
- Mounting hardware (screws, washers - may vary)
- Instruction Manual
4. Setup and Installation
4.1 Mounting
The Hella 8504 Series light is designed for deck mounting. Choose a location on your vessel that provides an unobstructed view for the masthead light and effective illumination for the deck floodlight, adhering to relevant navigation light regulations.
- Position the light in the desired mounting location.
- Mark the drilling points for the mounting screws.
- Drill pilot holes appropriate for the mounting screws.
- Secure the light to the mounting surface using the provided hardware. Ensure a tight and stable fit.

Image: The Hella 8504 Series Masthead/Floodlight Combination Light shown mounted on a mast, illustrating its dual function design with the masthead light at the top and the floodlight below.
4.2 Wiring
The light operates on a 12V DC system. Proper wiring is crucial for correct functionality and safety. Refer to the wiring diagram below and ensure all connections are secure and insulated.
- Identify the wires extending from the light fixture. Typically, these include positive (+) and negative (-) connections for each light function.
- Connect the positive (+) wire for the masthead light to your vessel's 12V DC positive supply, typically through a switch.
- Connect the positive (+) wire for the floodlight to a separate 12V DC positive supply, also through a switch.
- Connect the common negative (-) wire from the light to the vessel's 12V DC negative (ground) terminal.
- Use marine-grade connectors and heat-shrink tubing to protect all electrical connections from moisture and corrosion.
5. Operating Instructions
Once installed and wired correctly, operate the light using the dedicated switches on your vessel's control panel.
- Masthead Light: Activate the switch connected to the masthead light circuit. This light provides 360-degree white illumination for navigation.
- Deck Floodlight: Activate the switch connected to the deck floodlight circuit. This light provides downward-facing illumination for the deck area.
- Both lights can be operated independently or simultaneously, depending on your vessel's wiring and operational needs.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your Hella 8504 Series light.
- Cleaning: Periodically clean the lens and housing with fresh water and a soft cloth to remove salt, dirt, and grime. Avoid abrasive cleaners or solvents.
- Inspection: Regularly inspect the wiring for any signs of wear, corrosion, or damage. Check mounting screws for tightness.
- Bulb Replacement: This unit uses an LED light source, which typically has a long lifespan and does not require frequent bulb replacement. If replacement is necessary, consult a qualified technician or Hella Marine for compatible parts.
7. Troubleshooting
If you encounter issues with your Hella 8504 Series light, refer to the following common troubleshooting steps:
- Light Not Turning On:
- Check the vessel's power supply and ensure the relevant switch is in the 'ON' position.
- Inspect all wiring connections for looseness or corrosion.
- Check the fuse in the light's circuit. Replace if blown.
- Dim or Flickering Light:
- Verify stable 12V DC power supply. Low voltage can cause dimming.
- Check for corroded or loose wiring connections, which can increase resistance.
- Ensure the lens is clean and free from obstructions.
- Water Inside Housing:
- Immediately disconnect power.
- Inspect the housing seals and mounting points for damage or improper installation.
- If water ingress is significant, the unit may need to be replaced.
If these steps do not resolve the issue, contact Hella Marine customer support or a qualified marine technician.
8. Technical Specifications
| Specification | Value |
|---|---|
| Brand | Hella |
| Model Name | 998504001 |
| Voltage | 12 Volts |
| Wattage | 12 watts |
| Light Output Maximum | 715 Lumens |
| Brightness | 715 lumen |
| Light Source Type | LED |
| Lighting Method | halogen |
| Bulb Base | BAY15D |
| Material | Metal, Plastic, Stainless Steel |
| Color | Black |
| Water Resistance Level | Water Resistant |
| Special Feature | Waterproof |
| Mounting Type | Deck Mount |
| Item Weight | 2.35 Pounds |
| Package Dimensions | 10.1 x 8.6 x 4.6 inches |
9. Warranty and Support
For specific warranty information, please refer to the documentation included with your product or contact Hella Marine directly. Hella stands behind the quality of its products.
For additional support, product information, or to explore other Hella Marine products, please visit the official Hella store on Amazon:





