Strawberry growth has specific requirements for light quality (spectrum) and light intensity (PPFD). Reasonable spectrum matching can significantly promote its flowering, fruiting and accumulation of flavor substances. The following are the spectrum, color temperature and light management plan required for strawberry growth:
I. Key spectrum requirements for strawberry growth
1. Core spectrum components and functions
Spectral range Function Recommended ratio
Blue light (400-500nm) - Promote leaf thickening and inhibit excessive growth
- Enhance anthocyanin synthesis (improve fruit color) 20%-30% (can be reduced during the fruiting period)
Red light (600-700nm) - Drive photosynthesis and accelerate fruit expansion
- Promote flowering (660nm deep red light has the best effect) 50%-70%
Far red light (700-800nm) - Coordinate with red light to regulate flowering time (red light: far red light ≈ 4:1)
- Promote stem elongation (need to be carefully controlled) 5%-10%
Green light (500-600nm) - Penetrate the canopy to improve photosynthesis of lower leaves 5%-10%
UV-A (315-400nm) - Stimulate the synthesis of antioxidants (such as vitamin C) <3% (short-term exposure)
2. Spectral graph example
The ideal spectral curve should include:
Double peak structure: blue light peak (near 450nm) + red light peak (near 660nm).
A small amount of wide spectrum: 500-600nm green light fills the "spectral gap" and simulates natural light.
Ideal spectrum of strawberry (Note: This is for illustration, and it needs to be adjusted according to the spectral data of the lamp)
II. Suggestions for color temperature selection
Color temperature (unit: K) affects the morphology and physiological response of strawberries:
Seedling/growth period:
4000-5000K (cold white light, high proportion of blue light): promote compact plant shape and avoid leggy growth.
Flowering and fruiting period:
3000-3500K (warm white light, high proportion of red light): induce flowering and accelerate fruit ripening.
Universal for the entire cycle:
3500-4000K full spectrum LED (balanced blue and red) + supplementary 660nm deep red light module.
3. Lighting schemes for different growth stages
1. Seedling stage (from planting to flower bud differentiation)
PPFD: 200-300 μmol/m²/s
Spectrum: 30% blue light + 60% red light + 5% far-red light + 5% green light
Color temperature: 4500K
Photoperiod: 14-16 hours/day
2. Flower bud differentiation stage
PPFD: 300-400 μmol/m²/s
Spectrum: 20% blue light + 70% red light + 10% far-red light (promote flower bud formation)
Color temperature: 3500K
Photoperiod: 12 hours/day (short day can induce flowering)
3. Fruiting stage
PPFD: 400-600 μmol/m²/s
Spectrum: 15% blue light + 75% red light + UV-A 2% (increase sugar content and color)
Color temperature: 3000K
Photoperiod: 12-14 hours/day
IV. Recommendations for artificial light source selection
Household potted plants:
Lamp type: full-spectrum LED plant lamp (such as SANSI 36W)
Parameters: PPFD 300-400 μmol/m²/s (20-30cm from the leaves), color temperature 3500K.
Greenhouse supplementary lighting:
Lamp type: adjustable spectrum LED strip light (such as Philips GreenPower)
Parameters: adjust to red light mode (660nm+730nm far red) during flowering period, PPFD 500-800 μmol/m²/s.
Vertical farm:
Lamp type: COB LED + 660nm monochromatic light module
Parameters: PPFD 600-900 μmol/m²/s, UV-A irradiation for 10-15 minutes per day.
5. Notes
Light intensity and distance:
PPFD decreases sharply with increasing distance, and a quantum meter is required to measure the actual leaf light intensity.
Photoperiod control:
Short-day light (8-10 hours of darkness to promote flower buds) can be simulated before flowering, and light can be extended to 14 hours during the fruiting period.
Variety differences:
Day-neutral varieties (such as Albion) are not sensitive to photoperiods and require higher PPFD (increased by 20%).
VI. FAQ
Q: Can white light LEDs replace professional plant lights?
A: Ordinary white light LEDs (such as 5000K) can keep strawberries alive, but lack 660nm red light and UV-A, and the fruit quality is poor. It is recommended to choose full-spectrum LEDs or add red light supplementary lamps.
Q: Is ultraviolet light (UV-B) needed?
A: UV-B (280-315nm) may damage leaves. Strawberry cultivation usually does not need to be actively added, and trace amounts in natural light are sufficient.
By precisely controlling the light spectrum and light intensity, the yield of strawberries can be increased by 20%-50% and the sugar content can be increased by 2-3 degrees. It is recommended to regularly check the status of leaves (for example, purple indicates a lack of blue light, and excessive growth indicates a lack of red light) and dynamically adjust the lighting strategy. you can consoult strawberry grow led light on http://www.benweilight.com
