Color Temperature Mired Shift Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-050

Effect

Computation or source lookup only

Input and validation requirements

The formula reaches an undefined division-by-zero result when the applied shift makes resulting mired equal zero. The specification also leaves the sign convention and manufacturer gel lookup data insufficiently defined, allowing materially different outputs or missing gel recommendations.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "source_temperature_K": 6500,
    "gel_shift_mired": 159
  },
  "expected_outputs": {
    "source_mired": 153.8461538462,
    "resulting_mired": 312.8461538462,
    "resulting_temperature_K": 3196.459,
    "suggested_gel": "Full CTO",
    "suggested_gel_shift_mired": 159,
    "stop_loss": "unavailable from mired shift alone"
  },
  "reference_data": {
    "source_temperature_mired": {
      "temperature_K": 6500,
      "mired": 153.8461538462,
      "source_convention": "widely tabulated standard color-temperature value"
    },
    "gel_row": {
      "gel": "Full CTO",
      "mired_shift": 159,
      "source_convention": "widely tabulated standard value from common Rosco/Lee CTO mired-shift charts"
    }
  },
  "working": "source mired = 1,000,000 / 6500 = 153.8461538462 mired; resulting mired = 153.8461538462 + 159 = 312.8461538462 mired; resulting K = 1,000,000 / 312.8461538462 = 3196.459 K; the +159 lookup row corresponds to Full CTO."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json