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Enabling better global research outcomes in soil, plant & environmental monitoring.

SpectraPen LM 500

SpectraPen LM 500 is a handheld spectroradiometer that is pre-configured and pre-calibrated to measure spectral characteristics and to calculate key parameters like Lux, Lumen, PAR and Watt values. LM 500 is especially useful for rapid measurements of light intensity and of spectral light quality in the lab, greenhouse or field. It is also well-suited for wide scope of environmental, agricultural and ecological applications such as monitoring of artificial lighting used in horticulture industry or light source testing.

SpectraPen LM 500 is a complete system with integrated touch screen display and cosine corrector; it is powered by a Li-Ion rechargeable battery. Measured data – light spectrum, intensity readings in user defined range, CIE chromacity diagram, correlated colour temperature and many more parameters – are instantly displayed on the SpectraPen display and all recorded data are automatically stored into the device internal memory. Comprehensive software package and USB connectivity provide full system control, data acquisition and easy data post-processing in a PC. LM 500 comes with a handy carrying case.

SpectraPen LM 500 is available in two versions that differ in spectral range:
LM 500-UVIS: spectral response range 340 to 780 nm
LM 500-NIR: spectral response range 640 to 1050 nm

and two versions that differ in the position of the cosine corrector:
LM 500-H: cosine corrector facing up (for limited space measurements)
LM 500-V: cosine corrector facing front (for field measurements and tripod mount)


  • Handheld compact system measuring light intensity and light characteristics in various parameters
  • Precise radiometric calibration
  • Wide spectral response range: UV/VIS 340-780 nm; NIR: 640-1050 nm
  • Integrated cosine corrector
  • Data processing
  • Light parameter calculation
  • Fast spectra recording
  • Complete system – no PC or other bulky accessories needed
  • Durable and lightweight device with cost-effective price
  • Programmable via intuitive touch-screen
  • Both lab and field use
  • Battery-powered
  • USB connectivity to a PC for data collection and analysis
  • Integrated GPS (optional)


Optical Entrance: Cosine corrector
FWHM Bandwidth: 7 nm
Spectral Response Range: UV/VIS version: 340 nm – 780 nm
NIR version: 640 nm – 1050 nm
Spectral Response Half Width: * 9
Spectral Straylight: ** -30 dB
Wavelength Reproducibility: +/- 0.5 nm
Integration Time: Automatic; 5 ms to 10 s
Number of Pixel: 256
Dimension of Pixel: 0.5 x 15.8 mm
Touch Screen: 240 x 320 pixel; 65535 colours
Memory Capacity: 16 Mbit (up to 4000 measurements)
System Data: 16 bit AD conversion
Noise: 15 LSB RMS
Communication: USB
Dimension: 18 x 7.5 x 4 cm
Weight: 300 g
Case: Splash-proof
Battery: Li-ion; rechargeable via USB port of a PC
Battery Life: 48 hours (continuous operation)
Operating Temperature: 0 to +50°C
Storage Temperature: -20 to +70°C
Warranty: 1 year parts and labour

* Depends on the slit opening.
** When monochromatic light of Λ = 550 nm or Λ = 850 nm is input, spectral stray light is defined as the ratio of the count measured at the input wavelength, to the count measured at a wavelength 40 nm longer or shorter than the input wavelength.