Lighting, LEDs & Electrical Fixtures worked example

Burn-In Test Capacity at 99% chamber uptime: a worked example in lighting, leds & electrical fixtures

What does the result look like when chamber uptime reaches 99%? The full calculation is worked below with real intermediate numbers. Use this when checking whether burn-in test capacity can keep up with production output, planning additional rack space or chambers, scheduling overtime for test bottlenecks, or confirming test throughput before a large order ships.

The inputs for this scenario

  • Fixture positions per rack cycle: 48 fixtures / cycle (unchanged)
  • Available burn-in cycles per shift: 4 cycles (unchanged)
  • Chamber uptime: 99 % (raised for this scenario; the documented default is 88)
  • Burn-in first-pass yield: 98 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross burn-in capacity = fixture positions per cycle x cycles per shift) to the inputs above produces each figure below.
  • At this operating point the engine returns 186 fixtures for good fixtures cleared per shift, the number this scenario is built around.
  • At this operating point the engine returns 192 fixtures for gross burn-in test capacity.
  • At this operating point the engine returns 1.92 fixtures for fixtures lost to chamber downtime.
  • At this operating point the engine returns 3.8 fixtures for fixtures failing burn-in.

How this compares with the baseline

  • Against the tool's baseline example, where chamber uptime sits at 88% and the headline result is 166 fixtures, this scenario comes in 12.5% above the baseline at 186 fixtures.
  • A figure at this level is achievable when chamber uptime is genuinely sustained, not just peaked for a shift. It assumes full racks every cycle and a constant yield; partial loads, mixed fixture dwell times, and units sent for rework rather than scrap will change the real good-out figure.

Results at a glance

  • Good fixtures cleared per shift: 186 fixtures (headline result)
  • Gross burn-in test capacity: 192 fixtures
  • Fixtures lost to chamber downtime: 1.92 fixtures
  • Fixtures failing burn-in: 3.8 fixtures

Run it with your numbers

  • Every input above is editable in the live Burn-In Test Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.