ITL's testing of Horticultural lighting products is performed using our scientific grade integrating spheres/spectroradiometer systems and ITL type C goniophotometers. Our report for horticultural luminaires includes all the information typically required to evaluate the performance of luminaires intended horticultural lighting. And for lighting calculations, our goniophotometric report, in conjunction with the PAR (Photosynthetically Active Radiation) conversion factor included on the horticultural report, can be used to calculate PPFD (Photosynthetic Photon Flux Density) for any application. This is done by using a lighting application engineering program such as AGi32© or any other lighting application engineering program that can use a standard IES format photometric file.

Our standard horticultural report includes measured values as defined in the ANSI/ASABE S640 JUL2017 standard titled "Quantities and Units of Electromagnetic Radiation for Plants (Photosynthetic Organisms)". ASABE is the American Society of Agricultural and Biological Engineers, and ANSI is the American National Standards Institute, which should need no introduction.

Our standard horticultural report includes the following standard photometric, radiometric, and electrical data:

  • Total Integrated Flux (lumens)
  • PAR Conversion Factor
  • CIE 1931 Chromaticity Ordinates x,y
  • CIE 1976 Chromaticity Ordinate u',v'
  • Correlated Color Temp (CCT) in Kelvins
  • Total Radiant Flux (milliWatts)
  • Input Voltage
  • Input Current
  • Input Power (Watts)
  • Input Power Factor (%) (AC only)
  • Input Current THD (%) (AC only)
  • Input Voltage THD (%) (AC only)
  • Efficacy (lumens per watt)

In addition, our standard horticultural report includes horticultural specific data, including:

    PPF (Φp) Photosynthetic Photon Flux from 400-700nm, sometimes referred to as PAR (μmols/sec)
  • UVPF (Φp,UV) Ultraviolet Photon Flux from 280-400nm in micromoles per second
  • FRPF (Φp,fr) Far-Red Photon Flux from 700-800nm in micromoles per second
  • PBAR Photobiologically Active Radiation is the total Photon Flux from 280-800nm (μmols/sec)*
  • UVPF (UVA) Ultraviolet Photon Flux from 315-400nm, UVA range in micromoles per second
  • UVPF (UVB) Ultraviolet Photon Flux from 280-315nm, UVB range in micromoles per second
  • PF(Φ) (300-400nm) Total Photon Flux from 300-400nm in micromoles per second
  • PF(Φ) (400-500nm) Total Photon Flux from 400-500nm in micromoles per second
  • PF(Φ) (500-600nm) Total Photon Flux from 500-600nm in micromoles per second
  • PF(Φ) (600-700nm) Total Photon Flux from 600-700nm in micromoles per second
  • PF(Φ) (700-800nm) Total Photon Flux from 700-800nm in micromoles per second
  • Photosynthetic Photon Efficacy (Kp ) Efficacy in micromoles per second (PPF) per watt input

* PBAR was not adopted by ASABE as a standard definition but is included for reference

ITL's test reports allow for easy comparison between tested samples. In addition to the data listed above, our spectral distribution tabulation and plot are shown in micromoles per second per nanometer to provide a direct value of the photon flux.

ITL can also provide the spectral data in a CSV (comma separated value) file. This allows you (if desired) to import the spectral data into Excel© or other programs for additional evaluation.

Currently, unlike general lighting products which are tested using IESNA or other relevant industry standards, there is not a published standard for testing horticultural luminaires. Industry associations, such as ASABE, are currently working on standards specific to horticultural and agricultural lighting applications. In addition, energy efficiency rebate programs, such as DesignLights Consortium®, are also working to develop programs to support this growing segment in the lighting industry. Currently, there is often conflicting or erroneous information available for and about lighting for the horticultural marketplace. Until standards are adopted and implemented to further define metrics, measurement procedures, and performance for the horticultural lighting industry, you can count on ITL to provide honest, reliable, and independent third-party measurements.

ITL has been testing for the horticulture ("grow light") industry for quite a few years and have the expertise and capabilities to accurately test your horticultural luminaires. We are pleased to help you understand current standards and definitions and assist you as new standards are adopted.