AC/DC obstruction lights | aviation warning lights
OrganizationTypeEffective IntensityOperation Time
ICAOLow-intensity Type ARed steady > 10cdNight
ICAOLow-intensity Type BRed steady > 32cdNight
ICAOLow-intensity Type ERed flashing > 32cdNight
ICAOMedium-intensity Type AWhite flashing 20,000cd±25% at day & twilight, white flashing 2,000cd±25% at night; 20-60FPMDay+Twilight+Night
ICAOMedium-intensity Type BRed flashing 2,000cd±25%; 20-60FPMNight
ICAOMedium-intensity Type CRed steady 2,000cd±25%Night
ICAOMedium-intensity Type A/BWhite flashing 20,000cd±25% at day & twilight, red flashing 2,000cd±25% at night; 20-60FPMDay+Twilight+Night
ICAOMedium-intensity Type A/CWhite flashing 20,000cd±25% at day & twilight, 20-60FPM; red steady 2,000cd±25% at nightDay+Twilight+Night
ICAOHigh-intensity Type AWhite flashing 200,000cd±25% at day, 20,000cd±25% at twilight, 2,000cd±25% at night; 40-60FPMDay+Twilight+Night
ICAOHigh-intensity Type BWhite flashing 100,000cd±25% at day, 20,000cd±25% at twilight, 2,000cd±25% at night; 40-60FPMDay+Twilight+Night
FAAL-810Red steady > 32.5cdNight
FAAL-810 (F)Red flashing > 32.5cd, 20-40FPMNight
FAAL-864Red flashing 2,000cd±25%; 20-40FPMNight
FAAL-885Red flashing 2,000cd±25%; 60FPMNight
FAAL-865White flashing 20,000cd±25% at day & twilight, white flashing 2,000cd±25% at night; 40FPMDay+Twilight+Night
FAAL-866White flashing 20,000cd±25% at day & twilight, white flashing 2,000cd±25% at night; 60FPMDay+Twilight+Night
FAAL-864/L-865White flashing 20,000cd±25% at day & twilight, 40FPM; red flashing 2,000cd at night; 20-40FPMDay+Twilight+Night
FAAL-856White flashing 270,000cd±25% at day, 20,000cd±25% at twilight, 2,000cd±25% at night; 40FPMDay+Twilight+Night
FAAL-857White flashing 140,000cd±25% at day, 20,000cd±25% at twilight, 2,000cd±25% at night; 60FPMDay+Twilight+Night

AC/DC Obstruction Lights

Red low intensity obstruction lights are usually used for tall structures less than 45m above ground level as top lights. For structures over 45m, multiple low intensity obstruction lights are used on intermediate levels to mark the structure’s outline along with medium intensity obstruction lights. According to ICAO obstacle lighting standard (Edition July 2018), There are three types of low intensity obstruction lights based on two intensity levels and two operation types: >10cd steady, >32cd steady, and >32cd flashing. REDDOT OL32 (downward compatible to legacy model OL10) and OL100 (downward compatible to legacy model OL50) single and double obstruction lights are compliant to ICAO low intensity standard and FAA L-810 type.

Medium intensity obstruction lights are usually used for tall structures more than 45m above ground level. According to ICAO obstacle lighting standard (Edition July 2018), There are three types of medium intensity obstruction lights: red flashing 2,000cd±25%, red steady 2,000cd±25%, white flashing 20,000cd±25% at day, 2,000cd±25% at night. When a structure over 45m with painting or marking for daytime protection, red steady or flashing medium intensity beacons (F864) can be used alone, or red flashing medium intensity beacons combine with 32cd low intensity lights for marking painted structures at night. When a structure over 45m without painting or marking for daytime protection, white flashing medium intensity beacons (F865), or dual red-white medium intensity lights (F86465) can be used to mark the structure with 20,000cd at day and 2,000cd at night.

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