The CS120 Visibility Sensor from Campbell Scientific (UK) provides two user-configurable outputs which are typically used to drive external warning devices such as lights or fog-horns. However, these same outputs can also be used to switch the intensity of warning lights on wind turbines depending upon the ambient visibility. This means that wind turbine warning lights, which can dazzle pilots or cause a nuisance to nearby residents, need only be on full intensity when visibility is reduced allowing a reduction in their output when conditions are clear.
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