How to Use This Chart
Daily Light Duration: The number of hours a plant needs under grow lights each day.
Growth Stage: Different stages (seedling/vegetative/flowering & fruiting) may require different light durations.
Light Intensity: Must be combined with appropriate light intensity (PPFD values) for optimal results.
Importance of Dark Period: Many plants require a dark period to complete key physiological processes—do not overlook this.
Light Requirement Reference Chart for Various Plant Types
1. Leafy Greens & Herbs
| Plant Type | Daily Light Duration | Optimal Photoperiod | Growth Stage Notes | Special Requirements |
|---|---|---|---|---|
| Lettuce/Spinach/Kale | 12-14 hours | Long-day | Suitable for all stages; promotes leaf growth | Moderate intensity is sufficient; avoid overly high levels. |
| Basil/Mint/Cilantro | 14-16 hours | Long-day | Can extend to 16 hours during vegetative stage | Ample light enhances flavor. |
| Microgreens | 12-16 hours | Adjustable | Suitable for all stages; can reduce to 12 hours before harvest | Low to medium light intensity. |
2. Flowering & Ornamental Plants
| Plant Type | Daily Light Duration | Optimal Photoperiod | Key Growth Stage | Special Notes |
|---|---|---|---|---|
| African Violet | 12-14 hours | Day-neutral | Maintain consistent light during flowering | Avoid exceeding 16 hours, as it may inhibit flowering. |
| Orchids | 12-14 hours | Day-neutral | 14 hours during vegetative stage, 12 hours during flowering | Simulate natural light variations. |
| Begonia | 14-16 hours | Long-day | Maintain 14-16 hours to promote flowering | Medium light intensity required. |
| Succulents | 12-14 hours | Day-neutral | Generally consistent year-round | Slightly reduce in summer to prevent scorching. |
3. Fruiting Vegetables
| Plant Type | Daily Light Duration | Key Stage Adjustments | Fruiting Stage Advice | Important Notes |
|---|---|---|---|---|
| Tomatoes | 14-18 hours | Seedling: 16-18 hours Flowering/Fruiting: 14-16 hours | Maintain consistency for continuous fruiting | Ample light increases sugar content. |
| Peppers | 14-16 hours | Generally consistent across all stages | No adjustment needed during fruiting | Insufficient light may cause flower drop. |
| Strawberries | 12-14 hours | Vegetative: 14 hours Flowering/Fruiting: 12-14 hours | Ensure 10-12 hour dark period to promote flowering | Light quality affects flavor. |
| Cucumbers | 14-16 hours | Can extend to 16 hours during seedling stage | Maintain consistency during fruiting | Ensure even light distribution for vertical growth. |
4. Medicinal Plants
| Plant Type | Daily Light Duration | Photoperiod Control | Special Stage Needs | Important Considerations |
|---|---|---|---|---|
| Cannabis (Vegetative) | 18 hours on / 6 hours off | Fixed photoperiod | Promotes leaf and stem growth | Strict timing; avoid photoperiod disruption. |
| Cannabis (Flowering) | 12 hours on / 12 hours off | Strict 12/12 cycle | Triggers flowering response | No light interference during the dark period. |
| Echinacea | 14-16 hours | Long-day | Generally consistent across all stages | Medium light intensity is sufficient. |
5. Seedlings & Cuttings
| Plant Type | Daily Light Duration | Light Intensity | Special Recommendations | Duration |
|---|---|---|---|---|
| Most Seedlings | 14-18 hours | Low to medium | Promotes root development; prevents legginess | Until 3-4 true leaves appear. |
| Cuttings | 16-18 hours | Medium | Promotes rooting; maintain humidity | Until new roots are established. |
Professional Usage Tips
Photoperiod Controllers
For optimal results, we strongly recommend using a timer to control the light cycle. Our smart plant growth light series all support programmable timing functions to simulate natural daylight variations.
Seasonal Adjustment Simulation
Spring Simulation: Gradually increase light duration (add 30 minutes per week).
Summer Simulation: Maintain the maximum required light duration for the plant type.
Autumn Simulation: Gradually reduce light duration to trigger flowering responses.
Winter Simulation: Meet basic light requirements; may reduce by 1-2 hours if appropriate.
Identifying Plant Stress Signals
Insufficient Light: Leggy growth, smaller leaves, lighter color, reduced flowering.
Excessive Light: Leaf scorching, curling, bleaching, stunted growth.
Incorrect Photoperiod: Failure to flower, premature flowering, growth disorders.
Energy Saving & Efficiency Tips
Use reflective materials to improve light utilization.
Adjust light distance based on plant height.
Regularly clean light surfaces to maintain light transmission.
Consider full-spectrum LEDs to reduce energy consumption.
Choosing the Right Lighting Solution
Our plant light product line offers various solutions:
Basic Series: Suitable for leafy greens and herbs.
Professional Series: Equipped with timing and dimming functions, ideal for flowering plants and fruiting vegetables.
Smart Series: Programmable photoperiods to simulate natural daylight changes, suitable for commercial growing and sensitive plants.