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'Solutions for the special light Requirements of Cannabis crops'

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'Cannabis is a light-loving, short-day crop that is very sensitive to light conditions.'

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'2025-04-19 11:41:25'

'2025-04-19 11:41:25'

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'<p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Cannabis is a light-loving, short-day crop that is very sensitive to light conditions. Its light requirements mainly include light intensity, spectral ratio and photoperiod.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">The following are special light requirements and solutions for cannabis cultivation, covering core technical points such as spectrum, photoperiod, light intensity and intelligent control:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><h2 style="line-height: 1.75em;"><span style="text-wrap: nowrap;">I. Light requirements for cannabis growth stages</span></h2><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">1. Seedling period (0-3 weeks)</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Goal: Promote root development and avoid leggy growth.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Spectrum: Blue light (400-500nm) accounts for 30%-40%: inhibit stem elongation and increase stem thickness.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">A small amount of UV-B (280-315nm): activate disease resistance genes and reduce fungal infections (such as powdery mildew).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Light intensity: PPFD 200-300 μmol/m²/s.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Photoperiod: 18-24 hours of light (continuous light can accelerate growth).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Note: Avoid excessive red light that causes thin stems.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><h2 style="line-height: 1.75em;"><span style="text-wrap: nowrap;">2. Vegetative growth period (3~8 weeks)</span></h2><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Goal: Maximize leaf biomass and reserve energy for flowering period.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Spectrum: Red light (660nm) mainly (70%~80%): drives photosynthesis.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Blue light (20%~30%): keeps plants compact.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Optional far-red light (730nm, &lt;5%): regulates internode length through phytochrome.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Light intensity: PPFD 600~900 μmol/m²/s (high light intensity can shorten the cycle).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Photoperiod: 18 hours of light/6 hours of darkness.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Key skills:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">CO₂ concentration increased to 1000~1500 ppm (with high light intensity can increase yield by 30%+).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><h2 style="line-height: 1.75em;"><span style="text-wrap: nowrap;">3. Flowering period (8~12 weeks+)</span></h2><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Goal: induce flower bud differentiation and increase THC/CBD content.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Spectrum:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Deep red light (660nm) + far red light (730nm):</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">660nm directly promotes flowering.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">730nm activates the conversion of phytochrome Pfr→Pr, simulating short days in autumn (key!).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Reduce blue light (&lt;10%): avoid delayed flowering.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">UV-A (315~400nm): stimulate the synthesis of secondary metabolites (THC/CBD).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Light intensity: PPFD 800~1200 μmol/m²/s (high light intensity increases bud density).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Photoperiod: 12 hours of light/12 hours of darkness (strict darkness period is required, light leakage will cause atavism).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Scientific basis:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Far red light (730nm) can increase THC content by 15%~20% (Frontiers in Plant Science 2021).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><h2 style="line-height: 1.75em;"><span style="text-wrap: nowrap;">2. Core technical solutions for cannabis lighting</span></h2><p style="line-height: 1.75em;"><strong><span style="text-wrap: nowrap;">1. Adjustable spectrum LED (mandatory)</span></strong></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Recommended lamps:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Full spectrum LED + independent red/blue/far red channels (such as Luxgrow&#39;s lpu9 series).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">UV supplement module: needs to be controlled separately (excessive UV will damage leaves).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Advantages:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">One lamp covers the entire cycle, accurately matching the needs of each stage.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><p style="line-height: 1.75em;"><strong><span style="text-wrap: nowrap;">2. Photoperiod control (strict requirements</span></strong><span style="text-wrap: nowrap;">)</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Absolute dark period:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">The flowering period requires complete lightlessness (light leakage &gt; 5 μmol/m²/s may cause female plants to become male plants).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Solution:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Use light-sealed greenhouses or darkrooms for planting.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Install infrared surveillance cameras (check light leakage at night).</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;"><br/></span></p><p style="line-height: 1.75em;"><strong><span style="text-wrap: nowrap;">3. Canopy lighting uniformity</span></strong></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Problem: Traditional top supplementary lighting causes the upper buds to be too dense and the lower buds to be poorly developed.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Solution:</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Lateral supplementary lighting: Install vertical LED light strips to illuminate the middle leaves.</span></p><p style="line-height: 1.75em;"><span style="text-wrap: nowrap;">Laser lighting: Penetrate the canopy (in the experimental stage, the light efficiency is extremely high but the cost is expensive).</span></p>'

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