Study

Effects of dimming light-emitting diode street lights on light-opportunistic and light-averse bats in suburban habitats

  • Published source details Rowse E.G., Harris S. & Jones G. (2018) Effects of dimming light-emitting diode street lights on light-opportunistic and light-averse bats in suburban habitats. Royal Society Open Science, 5, 180205

Actions

This study is summarised as evidence for the following.

Action Category

Use low intensity lighting

Action Link
Bat Conservation
  1. Use low intensity lighting

    A replicated, randomized, controlled study in 2015 at 21 road sites in Hertfordshire, UK (Rowse et al 2018) found that street lights dimmed to an intensity of 25% had higher activity of Myotis spp. but lower activity of common pipistrelles Pipistrellus pipistrellus than street lights dimmed to 50% or left undimmed. A greater number of Myotis spp. passes were recorded at street lights dimmed to 25% than at street lights dimmed to 50% or left undimmed (data reported as statistical model results). Fewer common pipistrelle passes were recorded at street lights dimmed to 25% than at street lights dimmed to 50% or left undimmed. The activity of Myotis spp. and common pipistrelles did not differ between street lights dimmed to 25% and unlit controls. Each of 21 sites had three lighting columns (10 m high lamp posts with neutral light-emitting diode (LED) lights) along a stretch of treelined road. Each of four lighting treatments (controlled using pulse modulation) was applied for two consecutive nights/site in May–August 2015: 0% (unlit), 25% (average 11 lux), 50% (average 20 lux), undimmed (average 36 lux). Bat activity was recorded with a bat detector attached to the middle lighting column.

    (Summarised by: Anna Berthinussen)

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust