Lighting is installed on obstructions in order to warn pilots of a potential collision. The required intensity for this lighting is based upon an acquisition distance from which the pilot would recognize the lighting as identifying an obstruction, and be able to initiate evasive action to miss the obstruction by at least 600 metres. For an aircraft operating at 165 knots indicated airspeed (KIAS), the acquisition distance is 1.90 km. For an aircraft operating between 165 and 250 KIAS, the acquisition distance is 2.4 km.

References

AIM AGA 6.5 – Lighting

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