Introduction
Importance of Light in Greenhouses: Light is one of the most essential factors for plant growth in greenhouses. Without sufficient light, photosynthesis slows down, growth halts, and crop quality decreases. In controlled greenhouse environments, precise light management and measurement become crucial. This is where a lux meter plays an important role.
Why is Light Important in a Greenhouse?
Plants need light to produce energy. Each plant type requires a specific light intensity:
Vegetables and herbs: moderate to high light (15,000–30,000 lux)
Ornamental indoor plants: lower light needs (5,000–15,000 lux)
High-photosynthesis crops (like tomato and cucumber): very high light (over 30,000 lux)
Factors such as greenhouse cover material, season, sunlight angle, and artificial lighting systems influence light levels. To ensure optimal conditions, light should be regularly measured and adjusted.
What is a Lux Meter?
A lux meter measures light intensity in the unit of lux. One lux equals the light received on a surface one meter away from a single candle.
Importance of Light in Greenhouses
Types of Lux Meters Used in Greenhouses
1- Basic Digital Lux Meter
- Lightweight and affordable
- Ideal for quick, daily checks
2- Professional Lux Meter with Data Logger
- Records light levels over time
- Great for detailed light analysis
3- Lux Meter with Remote Sensor (cable-based)
- Measures hard-to-reach areas
- Useful for large-scale greenhouses
4- Mobile Apps (with limited accuracy)
- Convenient, but less accurate than specialized devices
Applications of Lux Meters in Greenhouses
- Assessing natural and artificial light conditions
- Determining proper locations for supplemental lighting (LEDs, HPS lamps)
- Preventing under-lighting or overexposure
- Saving energy through efficient lighting use
- Adjusting irrigation and fertilization based on light conditions
Conclusion
Light in greenhouse is a critical factor for plant growth and yield. Without proper measurement and control, even advanced greenhouses may fail to deliver results. Using a lux meter offers a practical, reliable solution to monitor and optimize this key element.
