You buy the “Bloody Red” jig because you think it looks like a wounded baitfish. It looks beautiful in the tackle shop under fluorescent lights. But here is the harsh reality.
At a depth of 15 meters, that red jig is no longer red. It is a dull grey shadow.
Water is a filter that absorbs light. Relying on “visible color” in deep water is not fishing; it is ignoring the laws of physics. Stop choosing colors for human eyes and start choosing for the physics of the ocean.
The Physics of Light Attenuation
Sunlight is composed of a spectrum of colors (ROYGBIV). When light enters water, it does not travel freely. Water molecules absorb specific wavelengths of light at different rates.
This is called Differential Absorption.
The “Red” Disappearance
- Long Wavelengths (Red/Orange): Low energy. Absorbed rapidly. By 5-10 meters, red is completely gone and appears black.
- Medium Wavelengths (Yellow/Green): Moderate penetration. Visible down to 30-50 meters.
- Short Wavelengths (Blue/Violet): High energy. Penetrates the deepest. This is why the ocean looks blue.
If you are jigging at 80 meters with a non-glowing red lure, you are fishing with a silhouette. The fish sees a shadow, not a “bloody baitfish.”
The JDM Solution: Emission
Since sunlight cannot reach the depths, Japanese anglers do not rely on reflection. We rely on Emission (creating light).
There are two distinct JDM technologies you must understand: Glow and Keimura.
1. Glow (Phosphorescence)
This material absorbs light energy and releases it slowly over time. In pitch-black water (100m+), a “Zebra Glow” pattern creates a high-contrast strobing effect as the jig falls, mimicking the bioluminescence of deep-sea squid.
2. Keimura (UV Fluorescence)
Keimura (Japanese for “Purple Irregularity”) reacts to Ultraviolet rays. UV light penetrates deeper than visible light. Keimura absorbs invisible UV rays and converts them into visible purple/blue light. To humans, it looks transparent; to fish, it glows.
Protocol: Depth-Based Selection
Stop guessing. Use physics to select your color based on target depth.
| Depth | Physics State | JDM Recommendation |
|---|---|---|
| 0 – 30m | Full Spectrum Visible | Silver / Gold (Flash) |
| 30 – 80m | Blue/Green Only + UV | Keimura (UV) / Silver |
| 80m – 200m+ | Darkness / Monochromatic | Full Glow / Zebra Glow |
Conclusion: Trust the Wavelength
Your eyes deceive you. Physics does not.
If you are heading to the deep, leave the pretty red lures for the display case. Equip yourself with JDM Glow and Keimura technologies that are engineered to be seen where it matters.
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