Introduction
This manual provides essential instructions for the safe and effective use of your Eiko PR12 Miniature Light Bulb. Please read this manual thoroughly before installation and retain it for future reference. The Eiko PR12 is an incandescent light bulb designed for specific applications, including flashlights and automotive uses, requiring approximately 6 volts, typically supplied by 5 D-cell batteries.
Setup and Installation
Follow these steps to properly install the Eiko PR12 Miniature Light Bulb:
- Safety First: Ensure the device (e.g., flashlight) is turned off and disconnected from any power source, or that batteries are removed, before attempting to replace the bulb.
- Identify Bulb Type: Confirm that your device requires a PR12 type miniature incandescent bulb with a flanged base and operates on approximately 6 volts (e.g., from 5 D-cell batteries).
- Remove Old Bulb: Carefully unscrew or unclip the old bulb from its socket. Dispose of old bulbs responsibly.
- Insert New Bulb: Align the flanged base of the Eiko PR12 bulb with the socket. Gently push and twist or secure the bulb into place until it is firmly seated. Do not overtighten.
- Test Functionality: Reinsert batteries or reconnect the power source and turn on the device to verify the new bulb is functioning correctly.

This image displays the Eiko PR12 Miniature Light Bulb. It features a clear glass envelope, revealing the filament inside, and a silver-colored flanged base designed for secure fitting in compatible devices.
Operating Instructions
The Eiko PR12 Miniature Light Bulb operates as a standard incandescent light source. Once properly installed in a compatible device and powered, it will emit light. Operation is typically controlled by the device's power switch.
- Power On/Off: Use the switch on your flashlight or other compatible device to turn the light bulb on or off.
- Brightness: The bulb provides a fixed brightness of 38 lumens.
- Voltage Compatibility: Ensure the power source provides approximately 6 volts for optimal performance and lifespan.
Maintenance
The Eiko PR12 Miniature Light Bulb requires minimal maintenance. However, following these guidelines can help ensure its longevity and performance:
- Cleaning: If the glass bulb becomes dirty, gently wipe it with a soft, dry, lint-free cloth. Avoid using abrasive cleaners or excessive moisture. Ensure the bulb is cool before cleaning.
- Handling: Always handle the bulb by its metal base to avoid transferring oils from your skin to the glass, which can create hot spots and reduce bulb life.
- Storage: Store spare bulbs in a cool, dry place, protected from physical impact.
- Replacement: The average lifetime of this bulb is 15 hours. Replace the bulb when it burns out or its light output significantly diminishes. Refer to the "Setup and Installation" section for replacement instructions.
Troubleshooting
If your Eiko PR12 Miniature Light Bulb is not functioning as expected, consider the following common issues and solutions:
- Bulb Does Not Light Up:
- Check Power Source: Ensure batteries are correctly inserted, fully charged, or the device is properly connected to its power supply.
- Check Bulb Seating: Verify the bulb is securely seated in its socket. Remove and reinsert if necessary.
- Inspect Filament: Visually inspect the bulb's filament. If it appears broken or disconnected, the bulb has likely burned out and needs replacement.
- Device Malfunction: Test the device with a known working bulb, if available, to rule out a malfunction in the device itself (e.g., faulty switch, corroded contacts).
- Dim Light Output:
- Low Battery Power: Replace or recharge batteries.
- Bulb Nearing End of Life: The bulb's brightness may decrease as it approaches its average lifetime of 15 hours. Consider replacing it.
- Dirty Bulb/Reflector: Clean the bulb and the device's reflector (if applicable) as described in the Maintenance section.
Specifications
| Feature | Detail |
|---|---|
| Brand | Eiko |
| Model Name / Part Number | PR12 / 40084 |
| Light Type | Incandescent |
| Wattage | 2.98 Watts (Nominal 3.00 Watts) |
| Voltage | 5.95 Volts (Nominal 6.00 Volts) |
| Current | 0.501 Amps |
| Bulb Shape Size | B3.5 (Also referred to as B10) |
| Bulb Base | Single Contact Miniature Flanged (PX13.5s) |
| Brightness | 38 Lumens |
| Average Lifetime | 15 Hours |
| Material | Copper (base) |
| Special Feature | Clear Glass Bulb, Flashlight Bulb |
| Specific Uses | Automotive, Lamp, Flashlight |
| Power Source | Battery Powered (e.g., 5 D-Cells) |
| UPC | 031293400840 |
Warranty Information
Specific warranty details for the Eiko PR12 Miniature Light Bulb are not provided in this manual. For information regarding product warranty, please refer to the original product packaging or contact Eiko customer support directly.
Customer Support
For further assistance, technical support, or inquiries about the Eiko PR12 Miniature Light Bulb, please visit the official Eiko website or contact their customer service department. Contact information can typically be found on the manufacturer's website or product packaging.





