Impact of LED Grow Light Thermal Effects on Plant Growth and Solutions

I. Thermal Effect Generation Mechanism

(a) Energy Conversion Characteristics

LED lamps convert electrical energy into:

Visible light (35-40%)

Infrared radiation (10-15%)

Heat (45-50%)

Typical 100W The surface temperature of LED grow lights can reach 50-65°C, and the junction temperature of the lamp beads may exceed 85°C.

(b) Environmental Control Strategy

Photothermal Decoupling Control

Use an intermittent lighting mode (15 minutes of light + 5 minutes of rest) to keep leaf temperature fluctuations within ±2°C.

Spatial Layout Optimization

Vertical rack spacing ≥ 80 cm

Maintain a 30-50 cm distance between the lamp and the canopy for dynamic adjustment

Use reflective film to increase light efficiency by 30%

II. New Solutions

(a) Spectral-Thermal Synergy Technology

Develop 580-610 nm yellow-green enhanced LEDs to reduce thermal radiation by 25-30% while maintaining photosynthetically active radiation (PAR).

(b) Heat Recovery Using the system, semiconductor thermoelectric modules are used to convert waste heat into stored electrical energy, achieving:

Lamp body temperature reduction by 15-20°C

Energy recovery efficiency of 12-15%

III. Industry Practice Case Studies

A 2024 Dutch greenhouse trial showed:

LED groups using active cooling systems saw a 17% increase in yield compared to passive cooling groups

Fruit vitamin C content increased by 23%

Energy consumption decreased by 22%

Professional Recommendation: We recommend configuring a DHT22 temperature and humidity sensor and an ESP32 controller to form an intelligent monitoring system. When the leaf temperature exceeds 32°C, the following actions will be automatically triggered:

LED power reduced to 70%

Circulation fan activated (2 m/s wind speed)

Nutrient solution circulation and cooling mode activated