The SpotOn quantum PAR sensor is an affordable meter that provides scientifically accurate Photosynthetic Active Radiation (PAR) light readings under any light source including LED.- Accurate PAR sensor from any light source- The Spoton Quantum PAR meter measures PAR ranging from 0 to 6,500 μmols/m²/sec- The PAR meter reads instantaneous PAR and has a DLI mode reading from 0 - 560 moles/m²/day The SpotOn quantum PAR sensor is an affordable meter that provides scientifically accurate Photosynthetic Active Radiation (PAR) light readings under any light source including LED. Accurate PAR sensor from any light source: Full sun to full shade indoors or outdoors LED Grow lights High Pressure Sodium Grow Lights Metal Halide Grow Lights Fluorescent Grow Lights The Spoton Quantum PAR meter measures PAR ranging from 0 to 6,500 μmols/m²/sec The PAR meter reads instantaneous PAR and has a DLI mode reading from 0 - 560 moles/m²/day