Waterproof Bi-Color LED Bulb

I need a bi-color LED bulb designed for outdoor safety signaling. The bulb should be red/green and operate on 12V DC. It should feature 12 LEDs mounted on a circular plastic base with a diameter of approximately 5 cm.

Key Requirements:
- Red/green bi-color configuration
- 12 LEDs
- Circular plastic base, ~5 cm in diameter
- 12V DC operation
- Water-resistant for outdoor use

Ideal Skills and Experience:
- Expertise in LED design and electronics
- Experience with water-resistant materials and construction
- Knowledge of 12V DC systems

Please ensure the design is robust enough for outdoor exposure.