A polar and position-indexed method for measuring spectrum, PPFD, DLI and temporal exposure in the rotating geometry.
Measurement grid
Measure at every cultivation position or at a justified symmetric subset covering axial level, angular position and radial plant plane. Record the detector orientation and distance from the central source.
Required conditions
| Condition | Measurement |
|---|---|
| Rotor static | position-by-position PPFD and spectrum |
| Rotor operating | time-resolved exposure or rotation-integrated measurement |
| Empty system | optical baseline |
| Representative canopy | self-shading and reflection effect |
| Thermal steady state | light output and leaf-temperature stability |
Uniformity statistics
ExplanationThis measures how uneven the light map is. A lower percentage means the measured positions receive more similar light.
ExplanationThe darkest measured point is divided by the average. A value closer to one means better minimum-to-average uniformity.
Published output
The calibration report contains the raw grid, polar heat map, spectrum, measurement uncertainty, detector model, light state, system geometry and DLI calculation. A single centre-point value is insufficient.
Spectral scope
The mapping protocol records the measured spectrum and includes far-red photons separately where present.