Lighting, LEDs & Electrical Fixtures worked example

Warranty Return Rate at 1.08% maximum acceptable warranty return rate: a worked example in lighting, leds & electrical fixtures

Here is what the math looks like when conditions slip. We hold every other input steady and drop maximum acceptable warranty return rate to 1.08%, then walk the calculation through step by step. Calculate the warranty return rate for LED fixtures or drivers as a percentage of the shipped population. Compares actual returns to your target maximum return rate to identify whether reliability performance meets specification.

The inputs for this scenario

  • Fixtures returned under warranty: 12 fixtures (held at the documented default)
  • Total fixtures shipped in the population: 2,000 fixtures (held at the documented default)
  • Maximum acceptable warranty return rate: 1.08 % (the input this scenario stresses; the baseline uses 1.5)

Working through the calculation

  • The calculation starts from the formula this tool documents: Warranty return rate = warranty returns / total shipped x 100.
  • Warranty return rate works out to 0.6 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target return rate works out to 0.48 points at these inputs.
  • Warranty returns works out to 12 count at these inputs.
  • Total shipped population works out to 2,000 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where maximum acceptable warranty return rate sits at 1.5% and the headline result is 0.6 %, this scenario lands almost exactly on the baseline at 0.6 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to maximum acceptable warranty return rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Returns lag shipments, so a low rate on a young population can understate the true failure rate once fixtures age into their failure window.

Results at a glance

  • Warranty return rate: 0.6 % (headline result)
  • Gap to target return rate: 0.48 points
  • Warranty returns: 12 count
  • Total shipped population: 2,000 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Warranty Return Rate calculator, set maximum acceptable warranty return rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.