FAA L-857
FAA L-857 high intensity white obstruction light at 60 flashes per minute (fpm)
Intensity Requirements and Beam Spread
| Step | Horizontal Beam Spread (degrees) | Vertical Beam Spread (degrees) | Effective Intensity (Candela) |
| Day | 90 or 120 | 3-7 | 140,000 +/- 25% |
| Twilight | 90 or 120 | 3-7 | 20,000 +/- 25% |
| Night | 90 or 120 | 3-7 | 2,000 +/- 25% |
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