21 September 2026
An analysis of scientific data on lettuce physiological response to increased PPFD levels and dynamic step-up lighting strategies across growth stages. We examine experimental findings on fresh and dry biomass accumulation, light use efficiency decline under continuous high photon flux, and the advantages of a 250→250→350 μmol/(m²·s) dynamic regime. This review is tailored for head growers and greenhouse lighting engineers evaluating retrofit economics and lighting design norms.
More: Increasing Lettuce Supplemental Lighting: Diminishing Returns and Dynamic Strategies
19 September 2026
In greenhouse operations, monitoring the spectral distribution of horticultural luminaires has traditionally required laboratory measurements in an integrating sphere or contracting external audit services. The release of the LX1400 PAR portable spectrometer from Dutch supplier Nieuwkoop simplifies on-site diagnostics of lighting installations. We examine the practical tasks addressed by the mobile device during incoming inspection and dynamic lighting monitoring, compare rapid field measurements with laboratory testing, and outline a protocol for chief engineers to audit LED equipment.
More: Monitoring LED Spectrum and Degradation: On-Site Rapid Analysis in Greenhouses
17 September 2026
A review of a study in Frontiers in Plant Science (2025) on the interaction of photoperiod, light intensity, spectrum, and temperature in Rex lettuce. Researchers proved that at a constant DLI of 13 mol/(m²·d) and 0% far-red light, combining moderate PPFD, an extended photoperiod, and higher temperatures accelerates leaf area expansion and photon capture (r² = 0.93). The article explains how agronomists and engineers can use these findings to lower connected load and optimize lighting schedules across electricity tariff zones.
More: Long Photoperiod and Moderate PPFD: Optimizing Lettuce Lighting
17 September 2026
Researchers from Wageningen University investigated the effect of LED supplemental light spectrum on the yield of greenhouse lettuce. The trial compared four spectral treatments with red light fractions ranging from 38% to 95% at a constant PPFD of 200 μmol/(m²·s). We review biomass measurements, deep-water culture methodology, and practical insights for commercial greenhouse operations aimed at reducing electricity consumption and production costs.
More: Effect of Red Light Fraction in LED Supplemental Lighting on Greenhouse Lettuce Yield
15 September 2026
The journal Svetotekhnika published research findings on hydroponic cucumber cultivation of the Svyatogor F1 hybrid across 12 full crop cycles. Scientists and engineers tested LED grow lights with adjustable spectra in the 600–700 nm and 700–780 nm bands at a PPFD of (200 ± 10) μmol/(s·m²). We examine the confirmed far-red to red ratios from 30/70 % to 60/40 %, the 70 % technological limit, and the value of this data for agronomists and designers modernizing greenhouse complexes.
More: Cucumber Lighting Spectrum: Red and Far-Red Balance Over 12 Crop Cycles
14 September 2026
A study on cucumber crops published in Horticulturae evaluated the agronomic and economic performance of specialized horticultural LEDs, industrial white LEDs, and high-pressure sodium (HPS) lamps. While HPS luminaires delivered the highest yield, LED systems demonstrated a clear advantage in energy efficiency and plant physiological stability. Here is an analysis of crop productivity, electricity consumption, and capital expenditures for informed greenhouse lighting decisions.
More: Horticultural LEDs, White LEDs, and HPS for Cucumber: Yield vs Cost Balance
13 September 2026
A review of scientific data on the impact of agrobiological factors and supplemental lighting regimes on tomato yield and biochemical composition. The article presents verified productivity metrics, including fruit count and total soluble solids, along with practical guidelines for greenhouse agronomists and facility designers to synchronize root system activity with lighting system parameters.
More: Tomato Supplemental Lighting: Effects of Light Regimes and Rootstocks
13 September 2026
Researchers from Ogarev Mordovia State University and Ardatov Lighting Plant evaluated dynamic spectra on Svyatogor F1 cucumber. Increasing blue radiation to 50–55% while reducing red by 20–25% and green by 5–10% during vegetative growth improved seedling biometrics and increased yield. We examine the 150 W luminaire with 0% to 100% DALI control, trial methods at PPFD (200 ± 10) μmol/(s·m²), and engineering constraints of multichannel systems in commercial greenhouse blocks.
More: LED Spectrum for Cucumber: Dynamic Regimes and Control Costs
