UV Curing worked example

UV Dwell Time Under Lamp at 14% dwell safety margin: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop dwell safety margin to 14%, then walk the calculation through step by step. Convert belt feet-per-minute and the lamp's effective cure-zone length into seconds the part spends under UV per pass.

The inputs for this scenario

  • Lamp cure-zone length: 10 in (held at the documented default)
  • Conveyor belt speed: 30 ft / min (held at the documented default)
  • Dwell safety margin: 14 % (the input this scenario stresses; the baseline uses 20)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base dwell (sec) = (cure-zone length ÷ 12) ÷ belt speed × 60.
  • Recommended dwell time works out to 0.38 sec under lamp at these inputs, and this is the headline figure for the scenario.
  • Base dwell (no margin) works out to 0.33 sec under lamp at these inputs.
  • Dwell margin applied works out to 14 % at these inputs.
  • Belt speed works out to 30 ft / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where dwell safety margin sits at 20% and the headline result is 0.4 sec under lamp, this scenario comes in 5% below the baseline at 0.38 sec under lamp.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to dwell safety margin, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Dwell time alone does not guarantee cure; it must be paired with irradiance to know the actual dose, since a fast lamp and long dwell can still under-deliver energy.

Results at a glance

  • Recommended dwell time: 0.38 sec under lamp (headline result)
  • Base dwell (no margin): 0.33 sec under lamp
  • Dwell margin applied: 14 %
  • Belt speed: 30 ft / min

Run it with your numbers

  • To rerun this with your own numbers, open the live UV Dwell Time Under Lamp calculator, set dwell safety margin to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.