International Light has designed several systems that can be used in photomedicine and environmental photobiology applications. The IL1704 and IL1404 Bilirubin Phototherapy radiometers are specifically designed to monitor lamp output in neonatal hyperbilirubinemia exposure chambers, with detectors designed to exactly match the photo-oxidation response of Bilirubin in the blood of Jaundice patients. These instruments are designed to measure in the 400nm to 500nm range. The IL1704 comes standard with the SED033/BR/W probe while the IL1404 comes standard with a compact SCL144 probe. Additional probes for wider spectral coverage are also available including the SED(L)033/TBLU/W with a wider spectral coverage.

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.

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.