Figure 1From: Optical efficiency characterization of LED phosphors using a double integrating sphere system Scheme of the DIS system. Illustration of the incident light hitting the phosphor sample placed between the two integrating spheres. Blue light, as well as converted light, are detected in each sphere by two spectrometers. Red arrows indicate the sites where light losses are prone to happen (see text). The graph shows the photon flux distribution curve of a phosphor sample.Back to article page