The aim of this project is to develop and test light dosimeters for application in museums. The new dosimeter will consist of sensitive dyes embedded in a polymer matrix and will be applied on a substrate (glass or paper). Laboratory and field studies will include investigations of the colour change of dosimeters to determine threshold values for light induced effects, time dependence, spectral sensitivity and synergetic effects with other parameters. Light dosimeters will provide a new tool for conservators and curators for quantifying the effect of light in museums before damage on sensitive objects occurs.