We report a new setup for the measurement of photoconductivity that is based on discrete quasimonochromatic light-emitting diodes. This setup allows new possibilities combining preexposure and measurement at different wavelengths as well as the possibility of rapidly switching from one wavelength to any other at will and also varying the irradiance over a comparatively wide range. It is also easy to use an equalized photonic flux over the entire operating wavelength range. We show the interest of using a normalized photoconductivity coefficient that takes into account the distribution of light in the sample's volume and characterizes the specific properties of the material. We report typical results obtained in different conditions for the same undoped Bi12TiO20 photorefractive crystal.774