FAA L-856 high intensity white obstruction light at 40 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 | 270,000 +/- 25% |
Twilight | 90 or 120 | 3-7 | 20,000 +/- 25% |
Night | 90 or 120 | 3-7 | 2,000 +/- 25% |
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