Lighting, LEDs & Electrical Fixtures worked example

Photometric Test Workload at 29% stabilization and reporting allowance: a worked example

What does the result look like when stabilization and reporting allowance reaches 29%? The full calculation is worked below with real intermediate numbers. Use this when scheduling photometric test capacity for a new product qualification, planning test lab hours before a product launch, estimating third-party lab costs based on test time, or managing a backlog of fixture samples awaiting LM-79 or LM-80 testing.

The inputs for this scenario

  • Fixtures requiring photometric testing: 24 fixtures (unchanged)
  • Test throughput rate: 3 fixtures / hr (unchanged)
  • Stabilization and reporting allowance: 29 % (raised for this scenario; the documented default is 25)

Working through the calculation

  • Applying the documented formula (Base photometric test time = fixtures to test / test throughput rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 10.32 hr for required photometric test time, the number this scenario is built around.
  • At this operating point the engine returns 8 hr for base photometric test time.
  • At this operating point the engine returns 29 % for stabilization and reporting allowance.
  • At this operating point the engine returns 3 pieces / min for test throughput rate (fixtures/hr).

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 3.2% above the baseline at 10.32 hr.
  • A figure at this level is achievable when stabilization and reporting allowance is genuinely sustained, not just peaked for a shift. It uses one blended throughput rate and one allowance; fixtures with long thermal stabilization or full goniophotometric scans take far longer than a quick sphere reading, so split those into separate runs.

Results at a glance

  • Required photometric test time: 10.32 hr (headline result)
  • Base photometric test time: 8 hr
  • Stabilization and reporting allowance: 29 %
  • Test throughput rate (fixtures/hr): 3 pieces / min

Run it with your numbers

  • Every input above is editable in the live Photometric Test Workload calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.