Our Measurement Technology
Most greenhouse lighting assessments stop at wattage, lux, or PPFD averages.
We don’t.
BelgraLux performs true wavelength-resolved spectral analysis, measuring the actual spectral power distribution (SPD) of light as it reaches the plant canopy — across the UV, visible, and near-infrared range.
Instead of reducing light to a single number, we capture thousands of discrete wavelength intensity points, allowing us to quantify how much energy is delivered at each biologically relevant band — blue, green, red, far-red, and beyond.
This matters because plants respond to wavelength, not brightness.
Plant responses are governed by wavelength, not by total intensity alone. Photosynthesis, photomorphogenesis, flowering, stress signalling, and circadian regulation are each driven by distinct spectral bands.
Our measurements resolve light at fine spectral intervals, allowing us to:
Quantify the exact distribution of photon energy across wavelengths
Identify spectral gaps, excess bands, and imbalances
Compare delivered spectra against known plant action and response ranges
Detect deviations caused by fixture design, optics, aging, or installation geometry
This goes far beyond “how much light” and focuses on what kind of light is actually reaching the canopy.
Real Canopy-Level Measurement
Lighting conditions inside greenhouses are rarely uniform. Reflections, shading, fixture height, angle, and plant architecture all reshape the spectrum before it reaches photosynthetic tissue.
BelgraLux measurements are taken in situ, at canopy level, capturing:
Spatial variation in spectral composition
Spectral distortion with height and distance
Differences between nominal and delivered spectra
This ensures that analysis reflects real plant exposure, not theoretical lamp output.
By measuring the full light spectrum at regular spatial intervals across the greenhouse (for example, every square metre), it becomes possible to construct a wavelength-resolved illumination map of the growing environment. Each measurement captures the complete spectral power distribution rather than a single aggregated metric, allowing spatial variations in blue, green, red, and far-red light to be visualised across the canopy. When these data are interpolated and plotted as a spectral heatmap, growers can immediately identify zones of spectral imbalance caused by fixture layout, reflection losses, shading, or aging light sources. This spatially resolved approach goes beyond conventional point measurements or average PPFD values, enabling evidence-based optimisation of lighting uniformity, crop-specific spectral targeting, and consistency of plant response throughout the greenhouse.
