An analyte measuring device (5) for monitoring for example levels of a tissue analyte (e.g. bilirubin) includes a number of narrow band light sources (10) each narrow band light source being structured to emit a spectrum of light covering a number of wavelengths and a number of detector assemblies (15) configured to receive light reflected from the transcutaneous tissues of a subject. Each of the detector assemblies includes a filter (20) and a photodetector (25) each filter being structured to transmit a main transmission band and one or more transmission sidebands wherein for each narrow band light source the spectrum thereof includes one or more wavelengths that fall within the transmission band of at least one of the filters and wherein for each narrow band light source the spectrum thereof does not include any wavelengths that fall within the one or more transmission sidebands of any of the optical filters. Fig.1
