FAA L-864/L-865
An FAA L-864/L-865 is a dual omnidirectional medium intensity aircraft warning light. The beacon flashes white at 40 fpm in day and twilight modes and flashes red at 30 fpm in night mode. The light flashes in sync with any other lights on the tower.
FAA L-864 Beacon Intensity Requirements
| Step | Beam Spread (Degrees) | Effective Intensity (Candela) |
| Day | 90 or 120 horizontal, 3-7 vertical | 140,000 ±25% |
| Twilight | 90 or 120 horizontal, 3-7 vertical | 20,000 ±25% |
| Night | 90 or 120 horizontal, 3-7 vertical | 2,000 ±25% |
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% |
Infrared Specifications
The nominal IR wavelength is 800-900 nm per FAA AC 150-5345-43J. An L-864 (L) beacon must emit an IR vertical beam width of ≥ 3° and a minimum IR radiant intensity of 246 mW/sr.
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