Avoiding spindly seedlings: the importance of good lighting
Good artificial lighting prevents young seedlings from becoming spindly (long and fragile stems) due to insufficient light. A suitable lamp mimics daylight and provides seedlings with the intensity and light spectrum they need to grow vigorously. The result: sturdier, stronger, and healthier plants, ready for transplanting.
The main types of lamps
Three types of lamps are commonly used for indoor seed starting:
- LEDs (LEDs) : very efficient, consume little, last a long time, but cost more to buy.
- Fluorescent (T5, T8, CFL) : affordable, ideal for beginners, but less powerful and average durability.
- HID (MH, HPS) : powerful, but consume a lot of electricity, generate heat and require more installation.
Comparative table
| Lamp type | Initial cost | Energy efficiency | Recommended use |
|---|---|---|---|
| LED | Pupil | Very high | Sowing in quantity, sustainable installation |
| Fluorescent | Low to moderate | Average | A few seed trays, small spaces |
| HID | Medium to high | Weak | Intensive cultivation, very powerful lighting |
Which lamp fits your budget?
- On a budget : a basic fluorescent or LED lamp. Sufficient for a few seedlings if placed correctly.
- Average budget : medium-sized LED panel or T5 fluorescent light bar. Ideal for growing multiple trays with good yield.
- High budget : premium full-spectrum LED panel. Allows for large area coverage and automated lighting.
Practical advice
- Duration : 14 to 16 hours of light per day, with a timer to keep a regular cycle.
- Distance : approximately 15 cm between the lamp and the leaves. Adjust as growth progresses.
- Light spectrum : favour a full spectrum (cool white, 6400 K) or blue/red, suitable for vegetative growth.