Photosynthetic Photon Flux (PPF) is the core metric for evaluating plant lighting luminaire output, while spectral distribution determines the effect of light quality on plant physiology. The IMS-2021 integrating sphere comprehensive test system quickly and accurately collects full-space luminous flux, making it the standard configuration for laboratory and production line testing. This solution is based on the IMS-2021 integrating sphere system, using BaSO4 integrating sphere with SPM-5000 high-precision spectroradiometer to establish an accurate measurement method for spectral radiance and PPF of plant lighting LED luminaires, ensuring traceable data and compliance with DLC horticultural lighting technical requirements and industry standards.

To meet both spectral distribution and total photon flux measurement needs, the IMS-2021 system recommends the spectroradiometer method (SPM-5000) over the broadband probe method to avoid measurement errors from LED spectral shift. The BaSO4 integrating sphere's high-reflectance wall ensures efficient flux collection. The integrating sphere-spectroradiometer method for plant lighting luminaire spectrum and PPF measurement is the most rapid and accurate absolute flux measurement approach. Strict adherence to self-absorption correction and standard lamp calibration provides reliable data for R&D, factory QC and DLC horticultural lighting technical requirements certification.

Key Features

• IMS-2021 integrating sphere comprehensive test system: BaSO4 sphere + SPM-5000 spectroradiometer; 380-800nm; avoids broadband probe misjudgment
• Accurate PPF photosynthetic photon flux measurement: µmol/s; meets DLC horticultural lighting technical requirements V3.0/4.0
• Self-absorption correction: auxiliary source corrects sphere self-absorption and luminaire absorption
• Band integration: PAR (400-700nm), blue, green, red, far-red (700-800nm)
• Complete reports: SPD plot, key parameters, band integration; traceable; DLC horticultural lighting compliant

Core Application Scenarios

Measurable parameters

Technical specifications

• IMS-2021 integrating sphere system: BaSO4 sphere; diameter per luminaire size (2m/1.5m/0.5m); wall reflectance >95%;
• SPM-5000 spectroradiometer: 380-800nm (far-red to 780-800nm), ≤2nm resolution; DLC horticultural lighting compliant;
• Auxiliary source: stable halogen or NIST/CNAS traceable standard lamp for self-absorption correction;
• Fibre and detector: cosine-corrected head or transmissive cosine integrator for uniform angular response;
• Electrical meter: power meter Class 0.2 or better, harmonic analysis; synchronous V, I, P, PF for PPE calculation.

Meet the standard requirements

• IES LM-79-19 Electrical and Photometric Measurements of Solid-state Lighting Products
• DLC Horticultural Lighting Technical Requirements V3.0/4.0

Test parameters