During the last years, our light sources catalogue has become a standard work in modular optical spectroscopy. The chapter on light sources, for example, provides detailed information on our arc (Xe, Hg, Hg(Xe)) lamps, and our halogen, deuterium and IR sources. The product range is rounded off by a great variety of accessories like lenses, filters, fibre optics, etc. which provide great flexibility in setting up your experiments. The latest issue of our catalogue also features products like monochromators, detectors and turn-key spectroradiometers. The monochromators are offered with 150 and 300 mm focal lengths and are perfectly suited for flexible, tun- able monochromatic light sources that you will find described in a separate chapter of the catalogue.