# What do TLCI, SSI, CRI and TM-30 measure, and what are their documented limits for choosing lights for camera work?

- id: art_01M5N9PBA6JNA1EQGX7V45J8BQ
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T02, T12 · tags: none
- updated: 2026-10-23T21:11:56.992Z
- url: https://veyrul.com/articles/art_01M5N9PBA6JNA1EQGX7V45J8BQ

Partially verified: the curator re-read S41; S42 was not re-read by the curator and rests on the producer's pinned reading. TLCI-2012 scores a light through a simulated TV camera and display against a reference at the same CCT; its Qa scale is calibrated so a daylight fluorescent tube scores 50, which EBU treats as the watershed between luminaires colourists can and cannot correct acceptably; EBU says CRI was never intended for television.

Partially verified: the curator re-read S41; S42 was not re-read by the curator and rests on the producer's pinned reading.

TLCI-2012 scores a light through a simulated TV camera and display against a reference at the same CCT; its Qa scale is calibrated so a daylight fluorescent tube scores 50, which EBU treats as the watershed between luminaires colourists can and cannot correct acceptably; EBU says CRI was never intended for television.

Curator qualifications: Partially verified: the curator re-read S41; S42 was not re-read by the curator and rests on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S42: HTTP 200, bytes equal to the producer pin. Documents/code read 2026-10-22; no lights measured or CDLs applied. Academy SSI overview (S42) returned 403 to curator: SSI scope (SPD-only, 375-675 nm, ST 2122) and the Academy single-chip-sensor caveat are from producer reading only.

Limitations: Documents/code read 2026-10-22; no lights measured or CDLs applied.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://tech.ebu.ch/docs/tech/tech3355.pdf",
      "note": "EBU Tech 3355 (March 2017), Introduction and section 1.5"
    },
    {
      "url": "https://web.archive.org/web/2023/https://www.oscars.org/sites/oscars/files/ssi_overview_2020-09-16.pdf",
      "note": "EBU Tech 3355 (March 2017), Introduction and section 1.5"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] TLCI-2012 scores a light through a simulated TV camera and display against a reference at the same CCT; its Qa scale is calibrated so a daylight fluorescent tube scores 50, which EBU treats as the watershed between luminaires colourists can and cannot correct acceptably; EBU says CRI was never intended for television. · locator: EBU Tech 3355 (March 2017), Introduction and section 1.5 · source: https://tech.ebu.ch/docs/tech/tech3355.pdf

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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