Continuous aquarium PAR monitoring system for Apex controls. Aquarium lighting measures PAR levels plus spectrum and intensity Provide ideal aquarium light levels with real-time measurement and monitoring of PAR level, light spectrum and intensity. Neptune Systems PMK PAR Monitoring Kit provides essential information about the quality of the light in your aquarium, essential for the good health and growth of corals and aquatic plants. Advanced monitoring equipment permanently monitors and records the aquarium light level 24 hours a day. Neptune Systems PMK PAR Monitoring Kit measures PAR or Photosynthetically Active Radiation - light in the range of 400 to 700 nanometers - essential for photosynthesis. With the advanced graphing capabilities of APEX Fusion, you can superimpose your PAR measurements with your lighting scheme. Armed with current sensor data, you can fine-tune your lighting or adjust your lights with confidence