Tannic: what light survives
Tannic: the light that survives here peaks at 680 nm, Secchi depth about 1.5 m. Which lure colour stands out, computed rather than charted.
Light that survives best here: 680 nm
Secchi ≈ 1.5 m
What this water lets through
| λ | Kd | c | 1 m | 5 m |
|---|---|---|---|---|
| 400 nm | 21.372 | 20.928 | 0.0% | 0.00% |
| 430 nm | 12.893 | 13.528 | 0.0% | 0.00% |
| 460 nm | 7.820 | 9.049 | 0.0% | 0.00% |
| 490 nm | 4.750 | 6.294 | 0.9% | 0.00% |
| 520 nm | 2.935 | 4.623 | 5.3% | 0.00% |
| 550 nm | 1.866 | 3.602 | 15.5% | 0.01% |
| 580 nm | 1.260 | 2.986 | 28.4% | 0.18% |
| 610 nm | 1.091 | 2.749 | 33.6% | 0.43% |
| 640 nm | 0.922 | 2.522 | 39.8% | 0.99% |
| 670 nm | 0.940 | 2.459 | 39.1% | 0.91% |
| 700 nm | 1.020 | 2.453 | 36.1% | 0.61% |
K_d is the diffuse attenuation of the light coming down; c is the beam attenuation along the line of sight. Confusing the two is the classic error in this field. Method and sources
Lure table
Ranked by how much each colour stands out to a Brook trout in these conditions.
| Colour | Contrast | Seen from | Fish view | ||
|---|---|---|---|---|---|
| 1 | White | 98 | 2.7 m | Buy now | |
| 2 | Chartreuse / white Fluorescent finish | 96 | 2.7 m | Buy now | |
| 3 | Glow Glow finish — not modelled | 95 | 2.7 m | Buy now | |
| 4 | Bone | 94 | 2.6 m | Buy now | |
| 5 | Chartreuse Fluorescent finish | 94 | 2.5 m | Buy now | |
| 6 | Silver holographic Metallic finish | 93 | 2.7 m | Buy now | |
| 7 | Pink / white Fluorescent finish | 90 | 2.7 m | Buy now | |
| 8 | Clown | 90 | 2.7 m | Buy now | |
| Stands out least | |||||
| Black / blue | 29 | 2.2 m | |||
| Purple / black | 20 | 1.8 m | |||
| Junebug | 0 | 1.2 m | |||
| Black | 0 | 1.1 m | |||
Contrast quoted at 76 cm viewing distance. · Light that survives best here: 680 nm
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UV cannot be shown — This species has a UV cone, and a phone screen cannot emit ultraviolet. The UV channel is drawn in a declared false colour. Note also that UV is absorbed fast underwater and vanishes within centimetres in tannic water.
Target species
Gear this page implies
- A Secchi disc See on Amazon
Lower it until it disappears and read the depth. That single number tells you which water type above is yours — it is the one optical measurement anybody can take.
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