Photobiology studies the interactions of light with living organisms. This application encompasses a number of areas including environmental photobiology, UV photobiology (studying the effects of ultraviolet radiation on plants, animals and humans, which has become an urgent concern of late), and photomedicine (using light to improve health), to name a few examples.

International Light has designed several systems that can be used in photomedicine and environmental photobiology applications.

The IL1750 and IL1450 Plant Growth Radiometers with PAR detectors are designed to measure the effect of light on plant growth. They features the new PAR detector, developed through the combined efforts of International Light electro-optical engineers and a team of plant physiologists.

The systems also use optional filters for each individual plant growth band (TBLU, TRED, & TFRD) for wavelength-specific research into the photobiological effect of lights on plants. These optional filters can be incorporated into an interchangeable system for use with a single detector, or multiplexed using several detectors and the A415 Detector Multiplexer.