Questions Fréquentes
Producteurs, chercheurs, zoos, architectes — toutes vos questions sur l’éclairage LED professionnel.
At identical PPFD and DLI, moving from 2.5 to 3.5 µmol/J reduces electricity consumption by approximately 29% on the lighting portion alone. For a 1,000 m² greenhouse under intensive production (18 h/day), this translates to 15–20% savings on the total energy bill. Our BloomLED VertiFarm 300W fixtures reach 3.2–3.5 µmol/J thanks to Samsung LM301H EVO chips, placing BloomLED among the French leaders in photosynthetic efficacy. GreenLight-type models confirm 31–35% site savings for HPS→LED at 2.5 µmol/J; reaching 3.5 µmol/J adds a further 5–8 points. Over 10 years, a 1 µmol/J difference can represent tens of thousands of euros in savings for a mid-sized installation.
For tomatoes, independent trials show 38–40% electricity savings per kg produced with BloomLED HortiStar vs 600W HPS, with yields rising from 60 to 80 kg/m²/year. For strawberries, a dynamic LED protocol achieves –41% lighting energy for equivalent commercial yield, with +54% Class I fruit on certain trials. For indoor lettuce, optimised BloomLED VertiFarm installations reach 9–11 kWh/kg (vs 20 kWh/kg on older systems). For cannabis, +10–25% g/m² and +20–30% g/W vs HPS at equivalent PPFD are reported. For basil and aromatic herbs, raising DLI from 5–8 to 14–18 mol/m²/day markedly increases biomass and essential oil concentration. BloomLED is today the French benchmark for HPS→LED conversion in intensive horticultural production.
Optimum PPFD depends on the crop and growth stage: leafy vegetables (lettuce, rocket) 200–400 µmol/m²/s; tomatoes/peppers in vegetative stage 400–600, in flowering 600–1,000; intensive cannabis 800–1,500+ µmol/m²/s. Our BloomLED engineers carry out a free DIALux simulation before every installation, with a PPFD map validated to ±15% uniformity over the useful area. Field validation uses Apogee MQ-500 sensors (±5%, drift <2%/year, NIST-traceable) recording real PPFD at multiple points (≥9 points at canopy level). For drawer-type growth chambers, we achieve ±5% thanks to optimised wall reflections.
DLI (Daily Light Integral) is the total dose of PAR photons received per day: DLI = PPFD × hours × 0.0036 (in mol/m²/day). Target values: lettuce 12–17, tomato 20–30, strawberry 12–17 mol/m²/day. Our BloomLED DALI-2 controllers couple quantum sensors (Apogee MQ-500) with lighting control to regulate DLI in real time: LED power is adjusted every 1–10 minutes based on natural daylight input. Advanced strategies account for the "previous day’s DLI" to lower the setpoint after a sunny day, saving energy without yield loss. The built-in REST API enables integration into your monitoring tools (Python, R, SCADA).
Absolutely: BloomLED offers zone-by-zone migration, keeping existing HPS ballasts in part of the greenhouse while the investment is being recovered. Our fixtures are compatible with standard 200–240V single-phase supply and install on the same mounting points. A preliminary energy audit identifies priority zones (maximum consumption/yield ratio) for a costed migration plan. LEDs dissipate 100% of their power as heat by convection, but with 40% less installed power than HPS; the thermal balance remains positive in the vast majority of cases. Ventilation and dehumidification adjustments are factored into the design.
Yes, but the mechanism is primarily microclimatic: BloomLED fixtures dissipate less radiant heat than HPS, reducing vertical thermal gradients and leaf condensation — the main factor promoting Botrytis cinerea. Trials show a 27–30% reduction in dehumidification energy with LEDs. A spectrum enriched in blue (400–500 nm) strengthens the plant’s physiological defences against powdery mildew, and targeted doses of UV-B (280–315 nm) induce flavonoid and glucosinolate biosynthesis pathways, improving pathogen resistance. In addition, precise VPD (vapour pressure deficit) control via LED programming maintains a foliar microclimate unfavourable to fungi.
The most accessible scheme is the CEE BAT-EQ-127 certificate: it requires fixtures ≥140–185 lm/W, L80 ≥50,000 h, PF >0.9, THD <25%, with dimming/detection. Premiums range from 35 to 83 kWh cumac/W installed, representing tens of euros per fixture — sometimes up to 100% of the project cost for large installations. The France 2030 / ADEME scheme supports greenhouse modernisation and agricultural energy transition. Our BloomLED fixtures are dimensioned to meet all these requirements: we compile CEE files and write ADEME technical reports. Financing packages (leasing, hire-purchase, 3×/6×/10× interest-free) allow the project to be self-financed from savings from the first year.
Standard 5-year warranty, extendable to 10 years, on all BloomLED fixtures. L70 (maintaining 70% lumen output) is guaranteed beyond 50,000 h. Our after-sales service is based in Pompey (Nancy): on-site response 24–48 h in the Grand Est region, parts dispatched within 24 h across France. We offer annual preventive maintenance contracts: photometric verification with calibrated sensors, optic cleaning, DALI-2 controller recalibration, written report. BloomLED commits to 3-month and 12-month follow-up reviews to validate the announced yields.
ANSI/ASABE S640 is the reference for plant photobiology: it defines PAR (400–700 nm), PPF (µmol/s), PPFD (µmol/m²/s) and extends measurement to UV (280–400 nm) and far-red (700–800 nm). IES LM-79 describes photometric and electrical testing procedures for LED luminaires (lumen flux, efficacy lm/W, distribution), forming the basis of performance reports. ISO 11664 (CIE colorimetry: xy, u’v’, CCT, CRI, TM-30) characterises the spectrum in terms of visual performance. Our BloomLED SpectraLab fixtures are delivered with S640 reports measured on a NIST-calibrated spectrophotometer, TM-30 characterisation (Rf/Rg), and IES/LDT files for inclusion in your publications. Plant photobiology journals (JXB, Plant, Cell & Environ.) increasingly require all three references.
Phytochromes absorb at 660 nm (Pr→Pfr, active) and 730 nm (Pfr→Pr, inactive); their photoequilibrium (PSS) depends on the R:FR ratio. An R:FR ratio of 1–4 maintains compact habit and balanced growth; below 1, shade-avoidance responses activate (elongation, early flowering). Cryptochromes (400–500 nm) regulate the circadian clock, photomorphogenesis, and stomatal opening; phototropins (450–490 nm) direct leaf curvature and tropism. UVR8 specifically absorbs UV-B (280–315 nm): even low doses (~0.5–1 kJ/m²/day) trigger HY5 and induce flavonoids, lignification and pathogen resistance. BloomLED SpectraLab multi-channel modules allow each band to be tested independently via dedicated 0–10V control per wavelength.
Broadband spectra (white + red + optional FR) cover 380–740 nm with CRI ≥90, TM-30 close to 100, and approach the solar spectrum — ideal for multi-species studies or experiments requiring extrapolation to natural conditions. Lettuce trials show +13–15% biomass and +30–55% flavonols under SunLike (broadband) vs pure red+blue at equal PPFD. Discrete multi-band LEDs (450/660/730 nm+) enable extreme spectral protocols (narrowband UV, isolated FR) that are irreplaceable for precise action-spectrum studies, at the cost of lower transferability to production. Our BloomLED SpectraLab modules are available in both configurations: broadband CRI 95+ or 4–8-band multi-channel adjustable in real time without interrupting the experiment.
LEDs exhibit thermal drift: flux varies by a few percent with junction temperature, requiring a stabilisation time of 5–30 minutes before photometric measurement or protocol start. Drivers can also induce flux discrepancies between successive switch-ons (tolerances ±2%). Recommended protocols include: strict room temperature control, multi-point PPFD measurements (≥9 positions at canopy level) with Apogee MQ-500 sensor (±5%, drift <2%/year), recalibration at each new experimental campaign, and continuous PPFD logging. The timestamped log of our BloomLED DALI-2 controllers automatically records every setpoint change, ensuring the traceability required by editorial committees.
Arabidopsis thaliana: 100–200 µmol/m²/s, 16 h photoperiod, DLI 6–12 mol/m²/day, 22–23 °C for a reproducible phenotype. Lettuce (Lactuca sativa): positive response between 7 and ~18 mol/m²/day (120–300 µmol/m²/s depending on photoperiod); DLI >17–22 mol/m²/day increases tipburn risk. Tomato: optimal DLI 20–30 mol/m²/day (200–300 µmol/m²/s, 16 h), with light compensation point at ~40–50 µmol/m²/s. Barley: 200–300 µmol/m²/s, 16 h, DLI 11–17 mol/m²/day to balance vegetative growth and reproduction. Our BloomLED SpectraLab fixtures offer predefined DLI profiles for these four species, editable via web interface or REST API.
Yes. Our BloomLED SpectraLab UV modules integrate narrowband UV-B emitters (280 nm and 310 nm available), independently adjustable via dedicated 0–10V. Doses of ~1 kJ/m²/day over 3–5 days double aliphatic and indolic glucosinolates in Brassicaceae and significantly increase chlorogenic and chicoric acids in lettuce. Arabidopsis transcriptomes show divergent responses at 280 vs 310 nm (shared UVR8/HY5, but distinct defence gene profiles). Note: beyond a few kJ/m²/day, photo-oxidative damage and reduced growth appear — we assist with dose calibration and protocol safety (PPE, shields, timers). Emitter optical filters are characterised to ±5 nm.
Our BloomLED DALI-2 controllers allow remote reprogramming of light recipes (intensity, duration, spectral ratio on multi-channel modules) without interrupting the experiment and without physical intervention. The web interface and REST API integrate into your Python or R scripts for automated control. For multi-year projects (INRAE, CNRS, universities), we maintain replacement parts for your configuration in stock, with an annual preventive photometric verification visit. Support contract: hotline 8 am–6 pm, email response within 4 h, on-site response within 48 h. Institutional orders (administrative mandates, MAPA up to €40,000, tender procedures) are fully managed by our sales team; pre-written CCTP specifications are available on request.
Flicker is a rapid variation in luminous flux linked to AC cycles (50 Hz) or poor power supply. Humans do not perceive it above 50 Hz, but many animals have a critical flicker frequency (CFF) well above that: birds 100–130 Hz, reptiles 80 Hz, some fish 60–200 Hz. Flickering light creates measurable chronic stress: elevated cortisol, stereotyped behaviours, loss of appetite, reproductive disorders. Our zoo-range fixtures drive LEDs on DC current with a flicker ratio (PFS) of <1% at all frequencies, validated to IEEE 1789-2015. Enclosure vegetation is illuminated by our GreenVisuaLED BioZone solutions, which combine flicker <1% and CRI 95+ for healthy plants and natural colour rendering for visitors.
CRI measures colour fidelity relative to natural light. With CRI 90, the R9 index (saturated red) can be low, making some shades appear dull. With CRI 95+ and R9 >50: fur, scales, plumage, and vegetation regain their natural vibrancy. For keepers, this is decisive: skin diseases, lesions, or colour changes are far more easily detected. For visitors, the visual experience is radically different. EAZA standards explicitly recommend CRI ≥90 as a minimum; our GreenVisuaLED BioZone solutions for vegetated areas and all our zoo fixtures achieve CRI 95+ with R9 >50, exceeding the recommendation.
It depends on the environment: tropical greenhouses and moist vivariums → IP65 minimum (jet-spray protection); aquariums and heavy-splash zones → IP67/IP68 (temporary immersion 30 min/1 m). Housings are anodised aluminium or UV-resistant polycarbonate, compatible with hydrogen peroxide (H&sub2;O&sub2;) and quaternary ammonium disinfection used in zoos. Enclosure vegetation with GreenVisuaLED BioZone also benefits from these IP65+ ratings, ensuring longevity in humid tropical environments (>90% RH). Concentrated chlorine directly on optics is not recommended; a detailed maintenance guide is provided with every installation.
Our DALI-2 and Casambi controllers allow programming of dawn/dusk scenarios with gradual transitions over 30–90 minutes, seasonal cycles (photoperiod varying by month), and CCT shifts simulating the natural morning/evening light progression. Banks of pre-programmed profiles are available: tropical forest (5,000–6,500 K, 11–13 h), savannah (4,000–5,000 K, 11–13 h), desert (6,500 K, 14 h), temperate (4,000 K, 8–16 h seasonal), arctic (extreme modulation). For photoperiodically reproductive species (moulting, egg-laying), timing precision is ±1 minute. Enclosure vegetation follows the same recipes via GreenVisuaLED BioZone, ensuring floristic and faunal consistency.
Heliophilic reptiles use UV-B (290–315 nm) to synthesise vitamin D3, essential for calcium metabolism. Our modules integrate calibrated UV-B emitters with a UV Index (UVI) of 1 to 10+, adjustable per species: ground gecko UVI 1–2, iguana UVI 4–6, desert tortoise UVI 6–10. UV-B intensity is adjustable independently of the visible spectrum, with its own time programming (basking period). UV-A-sensitive animals (birds, fish) also benefit from our UV-A emitters (315–400 nm), enabling natural vision and communication. We work directly with establishment veterinarians to establish UV profiles by species. Enclosure vegetation is lit by GreenVisuaLED BioZone modules without UV-B to protect the plants.
For a zoo tropical greenhouse, the target PPFD is 150–600 µmol/m²/s depending on the plants (vegetated by GreenVisuaLED BioZone), with CCT 5,500–6,500 K. For nocturamasmas (nocturnal animals: bats, slow lorises, pygmy sloths), very low intensities (1–5 µmol/m²/s) in deep red only (>650 nm) are used: imperceptible to human observers, with no disruption to the animal’s circadian rhythm. EAZA guidelines require animals to be able to retreat to completely dark zones at all times. Amsterdam ARTIS Zoo, the world’s first zoo certified as an "Urban Night Sky Place" (DarkSky), illustrates how a full LED overhaul reduces light pollution by more than 50% while improving animal welfare. Every project includes a DIALux report and a 2D layout plan.
Our fixtures meet the EAZA Best Practice Guidelines (lighting section), the European directive 2010/63/EU for laboratory/captive animals, and the standard NF EN 12464-1 for keeper workspaces. We provide a complete technical dossier for opening or renovation applications submitted to DREAL (animal-keeping permits, welfare assessments). London Zoo’s UV-B upgrade for reptiles and birds confirms that in-situ measurements after installation allow precise dose adjustment to veterinary requirements — a practice we systematically integrate into our procedure.
Traditional horticultural LEDs emit a red/blue spectrum producing a visually aggressive violet light, unacceptable in a living space or public building. Our GreenVisuaLED solutions resolve this contradiction: a broadened spectrum at CRI 95+, TM-30 Rf ≥95, Rg ≈100, delivering elegant and flattering white light. The Seoul SunLike chips used by GreenVisuaLED show +13–15% leaf biomass and +30–55% flavonoids vs pure red+blue at equal PPFD: plants are healthier and humans enjoy optimal visual comfort. On lettuce presented under SunLike, chlorogenic acid increases by +55% and chicoric acid by +31%, demonstrating richly stimulated photosynthesis and secondary metabolism. GreenVisuaLED is the French leader in biophilic lighting combining horticultural performance and architectural aesthetics.
2,700 K – luxury lobbies, gastronomic restaurants, hotels, upscale residential: warm and intimate light, enhances warm greens and organic plant textures. 3,000 K – relaxed offices, design boutiques, meeting rooms: perfect balance between warmth and crispness. 3,500 K – showrooms, open workspaces: dynamic neutral light. 4,000 K – hospitals, wellness centres, WELL spaces: close to daylight, stimulating and clarifying. In all cases, the R:B ratio (3:1 to 5:1) encoded in our GreenVisuaLED WallPro spectra guarantees efficient photosynthesis without compromising colour rendering. The GreenVisuaLED WallPro range is available in all four CCTs from stock, with dynamic CCT-change options to order.
The literature classifies plant-wall species into three groups. Low light (20–50 µmol/m²/s, DLI 1.5–3 mol/m²/day): pothos, aglaonema, ferns (Nephrolepis), stabilised mosses, sansevieria, syngonium, chlorophytum. Semi-shade (50–120 µmol/m²/s, DLI 3–6): ficus, monstera, philodendron, hedera, spathiphyllum, chamaedorea, epipremnum, colocasia. More demanding (80–200 µmol/m²/s, DLI 4–8): dracaena, bromelia, anthurium, certain ficus, pleioblastus. Recommended CCT: 3,000–4,000 K for all these categories, ensuring optimal green rendering. GreenVisuaLED provides a free PPFD mapping of the wall with recommended placement of each species according to the light thermal map.
Yes, this is perfectly achievable and very common in basements, corridors, and windowless shopping centres. The requirement is to reach each species’ target DLI with sufficiently long artificial lighting (12–16 h/day). Preferred species: pothos, aglaonema, sansevieria, ferns, spathiphyllum. A 20 m² wall dimensioned at 25 W/m² consumes 500 W; over 12 h/day this represents 6 kWh/day ≈ 2,190 kWh/year ≈ €400/year at €0.18/kWh. Adding a DALI-2 system with presence detection reduces this consumption by 20–40% in practice. GreenVisuaLED works with your landscape designer to select suitable species, dimension the lighting, and supply a programmed timer for full automation.
GreenVisuaLED offers several architectural solutions depending on the context and client constraints: ceiling-recessed tracks (flush aluminium profile, adjustable spots); linear LED strips integrated into niches or the edges of the plant wall; recessed spotlights in grazing angle for tall walls (>3 m); discreet projectors surface-mounted or on cable trunking; bespoke LED profiles built into the planter structure. Our engineers produce a custom integration plan in coordination with the architect and electrician, with 3D visualisation provided. All formats comply with NF C 15-100 (DCL, RCD, 1.5 mm² circuits) and meet applicable ERP requirements.
The difference is immediately visible, even to a non-expert. Under CRI 80: plant greens appear desaturated, reds and oranges (flowers, fruit) look brownish, human skin takes on a pallid appearance. Under CRI 95+ and R9 >50: green shades emerge with natural depth, reds/oranges pop, textures (bark, moss, shiny leaves) gain relief. GreenVisuaLED SunLike LEDs deliver CRI 97, TM-30 Rf ≥95, Rg ≈100: the difference from standard lighting is comparable to that between a supermarket and a luxury boutique. Studies show +43% accuracy on cognitive tasks performed near vegetation lit by a biophilic spectrum vs standard lighting.
GreenVisuaLED sizing guidelines in W/m² by wall type: decorative wall (mosses, shade plants) → 20–30 W/m²; mid-light wall (pothos, ficus, philodendron) → 30–50 W/m²; mixed wall with demanding species → 50–80 W/m². Variables: ceiling height (×1.2 per metre above 3 m), fixture-to-wall distance, adjacent surface reflectance. Example: 20 m² × 25 W/m² = 500 W × 12 h/day = 6 kWh/day = 2,190 kWh/year ≈ €400/year at €0.18/kWh. With DALI-2 and presence detection, actual consumption falls by 20–40%. Free DIALux simulation on plan after receiving dimensions and species selection.
Yes. WELL v2 (Features L01–L08) requires 150–240 vertical melanopic lux for ≥4 h and anti-flicker >90 Hz: our GreenVisuaLED fixtures meet both requirements (PFS <1%, calibrated CCT). LEED v4 (EQ Credit Daylight) requires 300–3,000 lux across 55–75% of spaces; GreenVisuaLED-lit vegetation contributes to visual comfort criteria. BREEAM Hea 01 and HQE target 10 reward NF EN 12464-1 compliance and dimming systems: our products meet these natively. We provide a certifiable technical dossier (product data sheets, PPFD measurements, EU 2019/2020 ecodesign compliance) to facilitate certification point acquisition. GreenVisuaLED is regularly specified by WELL/LEED project managers on biophilic tertiary projects in France.
Both, and that is the strength of GreenVisuaLED. Stock catalogue (48–72 h delivery): CRI 95+ recessed downlights in 18 W / 28 W / 38 W, slim low-profile LED tracks, 60 W design pendants, HortiBio 24 V LED strips. Bespoke (3–6 weeks): non-standard dimensions, custom CCT, specific power outputs, RAL finishes on request, IP67 outdoor fixtures, integration into furniture or joinery. All references — catalogue and bespoke — use the same premium chips: Samsung LM301H EVO, Seoul SunLike, Philips LUXEON, BridgeLux Thrive. The GreenVisuaLED range has been the French reference for plant wall and biophilic interior lighting for over 15 years.
Yes, our GreenVisuaLED WallPro solutions are compatible with all market protocols: DALI-2 (professional, compatible with Lutron, Helvar, ABB); Casambi (Bluetooth mesh, smartphone control without gateway); KNX (high-end building automation); 0–10 V (simple analogue dimming); DMX512 (event installations, light shows). Programmable scenes: progressive sunrise, occupancy-based variation, blind/shutter synchronisation, auto-off on presence detection. Actual consumption drops by 20–40% vs an uncontrolled system, meeting CEE BAT-EQ-127 and HQE requirements. Our partner electricians handle integration into your distribution board and full system commissioning.
Vous ne trouvez pas votre réponse ?
Nos experts sont disponibles pour répondre à toutes vos questions techniques.
Contact us