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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%