A source of artificial light is often required when investigating photosynthesis. The light source should have a spectrum similar to sunlight, have sufficient light intensity and should illuminate the object under investigation as uniformly as possible. There is hardly a light source that adequately fulfils all of these characteristics.
High intensities with a light spectrum similar to sunlight can normally be obtained using halogen lamps, but they have the disadvantage that they produce considerable heat and have an inhomogeneous light distribution. In the Lighting Unit FL-460 this general disadvantage of halogen lamps is overturned by the use of fiberoptics.