Lighting, LEDs & Electrical Fixtures worked example

Photometric Test Workload at 18% stabilization and reporting allowance: a worked example

This worked example runs the photometric test workload numbers for a tougher week than the baseline: 18% stabilization and reporting allowance instead of the typical 25%. Estimate total photometric testing hours for a batch of luminaires by combining fixture count, goniophotometer or integrating sphere throughput rate, and allowances for instrument warm-up, repositioning, stabilization time, and report generation.

The inputs for this scenario

  • Fixtures requiring photometric testing: 24 fixtures (held at the documented default)
  • Test throughput rate: 3 fixtures / hr (held at the documented default)
  • Stabilization and reporting allowance: 18 % (the input this scenario stresses; the baseline uses 25)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base photometric test time = fixtures to test / test throughput rate.
  • Required photometric test time works out to 9.44 hr at these inputs, and this is the headline figure for the scenario.
  • Base photometric test time works out to 8 hr at these inputs.
  • Stabilization and reporting allowance works out to 18 % at these inputs.
  • Test throughput rate (fixtures/hr) works out to 3 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where stabilization and reporting allowance sits at 25% and the headline result is 10 hr, this scenario comes in 5.6% below the baseline at 9.44 hr.
  • Use it when scheduling LM-79 or goniophotometer time, quoting a third-party test job, or planning a certification submission timeline. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required photometric test time: 9.44 hr (headline result)
  • Base photometric test time: 8 hr
  • Stabilization and reporting allowance: 18 %
  • Test throughput rate (fixtures/hr): 3 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Photometric Test Workload calculator, set stabilization and reporting allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.