# 📐 L2 Spec — Flash-LiDAR SPAD-Array Mismatch-Only Spec
**ID:** `L2-099-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-099`](/artifact/l1/L1-099)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41547813
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 1280 |
| W | px | 128 – 1280 |
| N t | — | 128 – 4096 |
| Tau tdc ps | — | 20 – 500 |
| Walk error | — | 0.0 – 0.2 |
| Dark count rate | — | 10 – 10000 |
| Pile up saturation | — | 0.0 – 0.5 |
| Ambient photon rate | — | 0.0 – 1000000 |
| Photon count per pixel | — | 1 – 1000 |
| Crosstalk neighbour pixels | — | 0.0 – 0.05 |
## 2. Tolerance (ε)
**Type:** `fn`
```
5.0 + 0.01 * tau_tdc_ps - 1.5 * log10(photon_count_per_pixel + 1) + 0.04 * log10(ambient_photon_rate + 1) * log10(ambient_photon_rate + 1) + 20.0 * pile_up_saturation
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |
## 4. Fingerprint
`f73d8937a76c040df6bd2a605975e0e81cae0659561dea92ef3e423981b8ecdf`
## 5. On-chain Registration
- **Chain hash:** `0x2736a3c91332cce1cacecde3f11dd730f66d3dc826ee29284db8d8780e3ae5af`
- **Chain tx hash:** `0xba8626bbab7042ae5b28d96f347d463c96aefcd95da4e5b49dbc518f4fb14161`
- **Chain block:** `41547813`
---
## File Mapping
This bundle consists of: `L2-099-001.md`, `L2-099-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-099-001.md` | Source of truth — edit this | Human or LLM |
| `L2-099-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-099-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._