An FAA L-866 is a white omnidirectional medium intensity aircraft warning light. The beacon flashes at 60 fpm.
FAA L-866 Intensity Requirements
|Step||Beam Spread (Degrees)||Effective Intensity (Candela)|
|Day/Twlight||360 horizontal, 3 minimum vertical||20,000 ±25%|
|Night||360 horizontal, 3 minimum vertical||2,000 ±25%|
Catenary lighting systems composed of L-857, L-866 or L-885 lights must have a sequenced flashing characteristic consisting of 3 lighting levels on or near each supporting structure. One light level near the top, one near the bottom or lowest point of the catenary and one midway between the other 2 points. The flash sequence is middle, top and then the bottom.
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