The DALE40 Phototherapy Radiometer is designed for the accurate measurement of light radiation in the blue part of the spectrum from 429 to 473 nanometers. Phototherapy exposure in this range is used in the treatment of hyperbilirubinemia in newborn children.

The DALE40 provides continuous measurement of irradiation by simply placing the detection probe under the phototherapy light (fluorescent lamps only). Light measurement is according to the percent response given the wavelength characteristics curve. The detector probe, included with the unit, has a wide angle lens which matches the cosine receiving function of human skin. Measurements are taken in µW/cm2, with a range of 0-1999. This unit of measurement can be compared directly to other units of measurement.