FAA L-864
An FAA L-864 is a red and infrared omnidirectional medium intensity aviation obstruction light. The light flashes at a rate between 20 and 40 fpm (typically 30 fpm for FAA applications under AC 70/7460-1L) and must flash in sync with any other lights on the structure.
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% |
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FAA L 864 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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