An FAA L-865 is a white omnidirectional medium intensity aviation obstruction light. The light flashes at a rate of 40 fpm and must flash in sync with any other lights on the structure.
FAA L-865 Intensity Requirements
|Step||Beam Spread (Degrees)||Effective Intensity (Candela)|
|Day||360 horizontal, 3 minimum vertical||20,000 ±25%|
|Twilight||360 horizontal, 3 minimum vertical||20,000 ±25%|
|Night||360 horizontal, 3 minimum vertical||2,000 ±25%|
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