There are huge gaps in our knowledge about the ways that increasing levels of artificial light influence the behaviour and ecology of bats. Some species that feed by aerial hawking may target insects attracted to street lights and derive some benefit from this enhanced food source. However, slower flying species are at greater risk from predators with increasing light levels and are likely to avoid illuminated areas. We are using remote monitoring techniques to examine the relationship between anthropogenic light (and noise) and corresponding levels of bat activity. We are particularly interested in differences between species in their response to artificial light. A pilot study in 2007, supported by a grant from MTUK, will examine patterns at four sites differing in light and noise levels. If the results are encouraging, we hope to expand the study to include enough sites to allow statistical analyses of any trends found.