FAA L-865
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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