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
9 September 2026
Bloemteknik proposes assessing lighting as a system of fixtures, controls and support. This article examines the stated Top Crop functions in the context of upgrading a Russian greenhouse. It distinguishes fixture replacement from new automation, sets out inputs for agronomists and engineers, and outlines specification and acceptance requirements. Russian examples help define the limits of comparison without replacing calculations for the actual greenhouse.
More: Controllable lighting: planning an upgrade for a Russian greenhouse
9 September 2026
A study in the Journal of Experimental Agriculture International shows how LED red-to-blue light ratios affect pepper flowering. A 2R:1B spectrum under a 16-hour photoperiod accelerates the transition to 50% flowering, while a 1R:2B ratio under a 14-hour photoperiod promotes fruit bulking and increases fruit weight. We examine how to leverage spectral control in protected cultivation seedling compartments to precisely manage crop development and schedule harvest timing.
More: Light Spectrum for Peppers: How Red-to-Blue Ratios Shift Flowering Time
3 September 2026
A study in ACS Omega evaluated the effects of monochromatic and combined LED light spectra on sweet pepper (Capsicum annuum L.) seedlings. Using randomized treatments with 10 plants per replicate, researchers tested 450, 530, and 660 nm wavelengths, white light, and a 50/50 red-blue mix. Monochromatic red light accelerated stem elongation, whereas 50/50 red-blue and white light promoted leaf blade expansion and the uptake of Zn, Cu, and Mn. Here is how greenhouse growers can adjust spectrums during winter light deficits.
More: Sweet Pepper Seedling Supplemental Light Spectra: Narrow vs. Mixed Bands
1 September 2026
A study of continuous lighting (24/0 photoperiod) at a fixed DLI of 16.9 mol/(m²·day) demonstrated up to 23% increase in lettuce fresh biomass and up to 18% improvement in energy use efficiency compared to an 18-hour photoperiod. Extending the photoperiod allows lowering operating PPFD, reducing installed grow light electrical capacity, and smoothing out peak loads on vertical farm HVAC systems.
More: Continuous Lighting at Constant DLI: Impact on Lettuce Yield
29 August 2026
A study on chrysanthemum flowering regulation provides experimental data for PPFD thresholds from 50 to 300 μmol/(m²·s), dark period duration, and vernalization regimes. Dropping PPFD below 100 μmol/(m²·s) delays floral bud initiation by 13–14 days and reduces marketable flower counts. Key photoperiod and PAR parameters help optimize year-round supplemental lighting design and prevent cut-flower production delays.
More: Chrysanthemum Flowering Control: Impact of PPFD, Photoperiod, and Vernalization
28 August 2026
Research on the effect of green light fraction on hydroponic lettuce shows that partial replacement of red-blue radiation with green light alters photosynthetic architecture, biomass accumulation, and foliar biochemical composition. At a PPFD of 350 μmol/(m²·s), replacing 40% of the photon flux with green light increases fresh weight by 33.16% and reduces nitrate concentration by 16.31%. We examine the physiological mechanisms of green photon penetration into the canopy, the balance between sugars and antioxidants, and the limits of applicability in hydroponics.
More: Green Light Fraction in Lettuce Cultivation: Impact on Biomass and Nitrates
