Grow light photon efficacy calculator

Calculate photon efficacy with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use photon efficacy to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Measured photosynthetic photon output (µmol/s)
1000
Measured electrical input (W)
400
Photon efficacy (µmol/J)
2.5

Try another scenario

Measured photosynthetic photon output (µmol/s)
1100
Measured electrical input (W)
400
Photon efficacy (µmol/J)
2.75
Calculation method

Calculation method

Photon efficacy (µmol/J)

Photon output per second divided by electrical joules per second; measurement basis must be supplied.

Symbols and units
a
Measured photosynthetic photon output (µmol/s)
b
Measured electrical input (W)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Measured photon output, electrical power. Returns Photon efficacy. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Measured photosynthetic photon output (µmol/s): minimum 0, maximum 1000000000000.0. Measured electrical input (W): minimum 1e-12, maximum 1000000000000.0.
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