High Intensity Obstruction Lights
High intensity obstruction lights are powerful white flashing beacons for the tallest structures, transmission towers, tall buildings and offshore platforms, marking them under the high intensity provisions of ICAO Annex 14 Volume I, class set by the aeronautical study, so they remain visible by day and night from long range. NLS supplies and installs high intensity systems in Saudi Arabia.
Inside the High Intensity Obstruction Lights
A high intensity obstruction light assembly pairs a xenon or high output LED strobe head with a discharge or driver unit and a synchronisation controller, giving the tallest structures a flash strong enough to read against daylight sky glare. The mounting and lightning protection components keep that output reliable at extreme elevation.
01
High Output Strobe Head
Generates the intense white flash visible from long range by day and night, built around a xenon tube or high output LED array sized to the classification the aeronautical study sets for the structure.
02
Discharge or Driver Unit
Charges and releases the energy pulse that fires the strobe head at the required intensity, converting site power into the short high energy discharge the flash tube or LED array needs on each cycle.
03
Flash Synchronisation Controller
Sets the flash rate and synchronises timing across every beacon marking the same structure, so a tower carrying several high intensity units flashes as one coherent pattern to an approaching aircraft.
04
Photocell Sensor
Reads ambient daylight level and signals the controller where the classification allows a reduced night setting, so the fixture is never brighter than the compliant level required after dark.
05
Lightning and Surge Protection
Isolates the strobe head, discharge unit and controller from voltage transients entering through the power feed, a direct exposure for the tallest point on a structure that is itself a natural strike target.
06
Elevated Mounting Assembly
Holds the strobe head rigid on transmission towers, tall buildings, chimney stacks or offshore platforms, keeping the beam angle fixed under sustained wind loading at height.
FULLY ASSEMBLED
High Intensity Obstruction Lights
| Flash source | Xenon discharge or high output LED strobe, class set by the aeronautical study |
| Body material class | Corrosion resistant housing rated for continuous exposure at extreme elevation |
| Ingress protection approach | Sealed optical, discharge and electrical compartments suited to wind-driven rain and dust at height |
| Power options | Grid, generator or hybrid site power with driver sized for high intensity discharge cycling |
| Control compatibility | Photocell and synchronisation controller, integrable with remote monitoring platforms |
| Mounting | Elevated bracket mounting engineered for transmission towers, tall buildings and offshore platforms |
| Operating environment | Engineered for continuous outdoor exposure at extreme height across the Kingdom's climate conditions |
Marking the tallest structures
Structures that rise well above 150 metres, transmission and broadcast towers, tall buildings, offshore platforms and flare stacks on major industrial sites, need the strongest class of obstruction lighting available. High intensity white flashing beacons under the corresponding ICAO Annex 14 Volume I provisions are engineered to be visible in full daylight as well as darkness, since a structure at this height is a hazard around the clock, not only after sunset.
Why these systems differ from lower classes
High intensity fixtures produce a far more powerful flash than medium or low intensity beacons and typically synchronize across multiple units on the same structure so pilots see a single coordinated warning rather than scattered flashes. They also draw meaningfully more power, which means the electrical design, cabling, and backup arrangements need to be planned into the structure from the outset rather than added as an afterthought. On offshore platforms and remote industrial sites, this often means integrating the lighting circuit with the facility's existing power and control systems rather than running an independent supply.
Aeronautical study and regulatory context
The number, position, and exact type of high intensity fixtures a structure needs come from a formal aeronautical study conducted against ICAO and FAA criteria, reviewed under GACAR Part 139 for Saudi airspace. Getting this wrong on a tall structure is a materially larger problem than on a low one, since the structure is likely closer to controlled airspace or approach paths by virtue of its height and the review process is correspondingly stricter.
NLS scope for high intensity projects
NLS works from the project's aeronautical study, or coordinates with the client's aviation consultant where one is engaged, to specify the correct number and placement of high intensity fixtures. Fixtures are sourced from established international aviation lighting OEMs built for this duty class, with synchronized flash controllers and photocell-based day and night switching. Installation on structures of this height calls for specialist access planning, whether via crane, climbing crew or platform-specific method, and NLS manages that access alongside the electrical and lighting scope so the project runs as one coordinated programme rather than separate contracts.
Commissioning and continuity
Commissioning includes verifying flash synchronization across all fixtures on the structure and confirming controller behaviour across day and night transitions. Given the criticality of a tall structure remaining lit, NLS recommends remote monitoring on high intensity installations so any fixture or synchronization fault triggers an alert rather than going unnoticed until a routine inspection.
Specifications
- ✓White flashing output conforming to the high intensity provisions of ICAO Annex 14 Volume I, class set by the aeronautical study
- ✓Synchronized multi-fixture flash controllers for structures carrying several units
- ✓Photocell-based automatic day and night intensity switching
- ✓Heavy-duty power supplies engineered for continuous high-output operation
- ✓Mounting and access solutions suited to towers, tall buildings and offshore platform structures
- ✓Remote monitoring integration recommended for fixture status and flash synchronization alerts
Frequently Asked Questions
At what height does a structure typically need high intensity obstruction lights?+
Structures rising well above 150 metres, or any structure an aeronautical study flags as needing the highest visibility class regardless of height, typically require high intensity fixtures. The exact requirement always comes from the study, applied under ICAO and FAA criteria and reviewed against GACAR Part 139 in Saudi airspace.
Do high intensity lights need to flash in sync across a tall tower?+
Yes, where a structure carries multiple high intensity fixtures, synchronized flashing is standard practice so pilots perceive one coordinated warning rather than random flashes at different points on the structure. NLS specifies controllers that synchronize all units on the structure.
Can NLS supply high intensity obstruction lighting for offshore platforms?+
Yes. NLS supplies and can coordinate installation of high intensity fixtures for offshore and marine-industrial structures, integrating the lighting circuit with the facility's existing power and control systems where required.
What is the role of the High Output Strobe Head in High Intensity Obstruction Lights?+
Generates the intense white flash visible from long range by day and night, built around a xenon tube or high output LED array sized to the classification the aeronautical study sets for the structure.
What is the role of the Discharge or Driver Unit in High Intensity Obstruction Lights?+
Charges and releases the energy pulse that fires the strobe head at the required intensity, converting site power into the short high energy discharge the flash tube or LED array needs on each cycle.
What is the role of the Flash Synchronisation Controller in High Intensity Obstruction Lights?+
Sets the flash rate and synchronises timing across every beacon marking the same structure, so a tower carrying several high intensity units flashes as one coherent pattern to an approaching aircraft.
What is the role of the Photocell Sensor in High Intensity Obstruction Lights?+
Reads ambient daylight level and signals the controller where the classification allows a reduced night setting, so the fixture is never brighter than the compliant level required after dark.
What is the role of the Lightning and Surge Protection in High Intensity Obstruction Lights?+
Isolates the strobe head, discharge unit and controller from voltage transients entering through the power feed, a direct exposure for the tallest point on a structure that is itself a natural strike target.
What is the role of the Elevated Mounting Assembly in High Intensity Obstruction Lights?+
Holds the strobe head rigid on transmission towers, tall buildings, chimney stacks or offshore platforms, keeping the beam angle fixed under sustained wind loading at height.