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THE FEUTEX TOOLKIT

Aquarium Light Schedule Overlap

Calculate total lit hours and overlapping operation for two same-day lighting windows.

Aquariums workspace● Runs in your browser
01 Your input
02 Your result
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FormulaOverlap = Math.max(0,Math.min(end_a,end_b)-Math.max(start_a,start_b)); Lit hours = end_a-start_a+end_b-start_b-Math.max(0,Math.min(end_a,end_b)-Math.max(start_a,start_b)); Energy = ((end_a-start_a)*watts_a+(end_b-start_b)*watts_b)/1000

Worked example

Inputs

Start a
8 hour
End a
16 hour
Start b
12 hour
End b
20 hour
Watts a
30 W
Watts b
20 W

Expected results

Overlap
4 h
Lit hours
12 h
Energy
0.4 kWh/day

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the measured quantities and your own planning assumptions.
  2. Review all calculated outputs and the stated limitations.

Try this example

{
  "start_a": 8,
  "end_a": 16,
  "start_b": 12,
  "end_b": 20,
  "watts_a": 30,
  "watts_b": 20
}

Accuracy and scope

Schedule accounting only. Does not recommend photoperiod, intensity or suitability for any organism.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.