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The idea has been around for a long time and was first implemented in Europe and North America, but it was pioneered in Kenya eight years ago. When the lights go out, you will need to replace the battery, but the supplier's kit normally includes maintenance for a year (in the case of lights for life), so you can still call and they will come and do the maintenance. It is claimed that the lights are 99 percent effective, with only one case of a lion being confirmed to have crossed the lights since they were first installed in Kenya.