The minimum light transmittance for greenhouse crops should be determined based on the type of covering material and the crop species. Specific standards are as follows:
01 Basic Standards
General Minimum Value: Most common crops (such as leafy vegetables) require a light transmittance of 70% or higher in conventional greenhouses to maintain basic growth requirements.
Variations in Covering Materials:
Plastic Film: New film generally has a light transmittance of 80%-90%, but in practice, due to aging, contamination, and other factors, a minimum light transmittance of 85% or higher must be maintained.
Glass: The standard light transmittance requirement is 91.5% or higher.
Solar Greenhouse: The light transmittance is typically 70% or higher.
02 Differences in Crop Requirements
High-light Crops: Vegetables (such as tomatoes and peppers) and ornamental flowers require a light transmittance of 90% or higher.
Medium-light Crops: For some leafy green vegetables or shade-tolerant crops, the light transmittance can be reduced to around 85%.
Special Adjustment Scenarios: In areas or seasons with excessive sunlight, light transmittance can be adjusted to 60%-70% using tools such as sunshade nets.
03 Key Influencing Factors
Material Properties: Materials with high haze (such as diffused glass) reduce light transmittance. High-transmittance, low-haze covering materials are preferred.
Maintenance and Cleaning: Regularly clean dust and scale from the surface of the covering material to prevent a 10%-20% decrease in light transmittance.
In summary, greenhouse light transmittance needs to be adjusted dynamically based on the specific growing scenario, but the minimum light transmittance of the covering material itself should not fall below 70%.
The diffuse glass and AR-coated diffuse glass produced by Yuhua have cooperated with many large commercial greenhouses in agriculture, horticulture, nurseries and experiments. We have cooperated with large greenhouse project companies such as Havecon, Van Der Hoeven, Kubo, etc. for many years. Yuhua greenhouse glass has a light transmittance of up to 99%, and haze 5/10/20/30/50/70/75 greenhouse diffuse glass is available!
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