TLOF Perimeter Lights
TLOF perimeter lights are the fixed green fixtures that outline the touchdown and lift-off area of a helipad or heliport so a pilot can identify its edges and orientation at night or in low visibility. NLS sources and installs TLOF perimeter lighting engineered to ICAO Annex 14 Volume II and GACAR Part 138 across Saudi Arabia.
Inside the TLOF Perimeter Lights
Download technical datasheet (PDF)TLOF perimeter lights mark the touchdown and lift-off area boundary so a pilot can identify the usable landing surface at night or in poor visibility. The assembly pairs a sealed optical unit with an LED source and a weatherproof mounting base, built to sit flush or elevated at the pad edge without becoming an obstruction itself.
01
Light Housing
The outer enclosure carries the optical and electrical components and protects them from moisture, dust and impact at the pad edge. Its shape and mounting profile keep the fixture low enough to avoid becoming a rotor or ground hazard.
02
Optical Lens Assembly
Shapes and directs the light output into the beam pattern required for perimeter marking, keeping the signal visible to an approaching pilot at the correct angle. The lens material and seal also block moisture ingress into the optical chamber.
03
LED Module
Generates the light output at the colour and intensity specified for perimeter marking. Solid state LED sources give a long service interval compared to older lamp technology, reducing the frequency of relamping at height or at pad edge.
04
Sealing Gasket
Forms the weatherproof barrier between the housing and lens assembly, keeping the ingress protection rating intact through repeated thermal cycling and washdown. A degraded gasket is a common cause of moisture ingress in perimeter fixtures.
05
Mounting Flange
Anchors the fixture to the pad surface or edge structure at the height and orientation the layout requires. The flange design allows flush or semi-flush mounting so the fixture does not project into the operating area.
06
Cable Gland Connector
Seals the point where the supply cable enters the fixture, preventing water tracking along the cable into the electrical chamber. It also provides strain relief so vibration or handling does not stress the internal wiring connections.
FULLY ASSEMBLED
TLOF Perimeter Lights
Explore the assembly
01
Light Housing
The outer enclosure carries the optical and electrical components and protects them from moisture, dust and impact at the pad edge. Its shape and mounting profile keep the fixture low enough to avoid becoming a rotor or ground hazard.
02
Optical Lens Assembly
Shapes and directs the light output into the beam pattern required for perimeter marking, keeping the signal visible to an approaching pilot at the correct angle. The lens material and seal also block moisture ingress into the optical chamber.
03
LED Module
Generates the light output at the colour and intensity specified for perimeter marking. Solid state LED sources give a long service interval compared to older lamp technology, reducing the frequency of relamping at height or at pad edge.
04
Sealing Gasket
Forms the weatherproof barrier between the housing and lens assembly, keeping the ingress protection rating intact through repeated thermal cycling and washdown. A degraded gasket is a common cause of moisture ingress in perimeter fixtures.
05
Mounting Flange
Anchors the fixture to the pad surface or edge structure at the height and orientation the layout requires. The flange design allows flush or semi-flush mounting so the fixture does not project into the operating area.
06
Cable Gland Connector
Seals the point where the supply cable enters the fixture, preventing water tracking along the cable into the electrical chamber. It also provides strain relief so vibration or handling does not stress the internal wiring connections.
| Body material class | Corrosion resistant metal or engineering-grade polymer suited to continuous outdoor exposure |
| Ingress protection approach | Sealed housing and gasket design rated for washdown and standing water at pad level |
| Power options | Series circuit constant current or low voltage DC configurations depending on the airfield lighting system in use |
| Control compatibility | Compatible with constant current regulators and standard airfield lighting control panels |
| Mounting | Flush or semi-flush mounting at the pad perimeter to avoid obstructing the operating surface |
| Operating environment | Engineered for outdoor helipad and heliport exposure across the Kingdom's temperature and dust conditions |
TLOF perimeter lights are the fixed green omnidirectional fixtures spaced evenly around the touchdown and lift-off area on a helipad or heliport, marking its exact boundary so a pilot approaching at night or in reduced visibility can judge the deck's size, shape, and orientation before committing to the approach. On elevated helidecks and rooftop pads the perimeter line often doubles as the reference a pilot uses to hold a stable hover before descent, which is why fixture spacing, colour consistency, and mounting height tolerance all sit inside the same design envelope rather than being treated as separate decisions.
ICAO Annex 14 Volume II sets the colour, intensity, and beam characteristics for TLOF perimeter lighting, and GACAR Part 138 applies the same reference to licensed Saudi heliports and helidecks. Fixtures are typically flush or semi-flush mounted so rotor downwash and ground traffic don't strike a protruding lens, and the photometric design has to hold up under direct helicopter downwash loading, a condition a standard ground-lighting fixture built for aircraft taxi routes was never tested against.
This is a specialism NLS has built specifically around helipad and heliport work, not a lighting category picked from a general catalog. NLS sources LED TLOF perimeter fixtures built to IEC 60598 luminaire safety requirements, in flush and semi-flush formats, matched to the pad's power supply arrangement, whether that's a standalone constant current regulator circuit dedicated to the pad or an integration point into a larger airfield lighting control system where a heliport shares a site with a licensed aerodrome.
Saudi ambient conditions add two considerations beyond the base ICAO photometric spec. Rooftop and elevated helideck installations run through a harsher thermal cycle than a ground-level pad, with the fixture housing exposed to direct sun on a metal deck structure that can hold heat well past the surrounding air temperature, so housing material and thermal derating need checking against the actual deck surface rather than ambient air alone. Sand and dust ingress over time also erodes seal integrity faster on an exposed elevated site than on a sheltered ground pad, making IP66 or higher sealed housings the practical baseline rather than an upgrade option.
NLS delivers TLOF perimeter lighting as part of a turnkey helipad and heliport package, design, supply, installation, and commissioning under one desk, sourced from established international aviation lighting manufacturers and priced in USD for the supply scope and SAR for the customer-facing commercial offer. A project team typically shares the pad layout drawing (diameter or dimensions, elevated or at-grade, power availability) and NLS returns a fixture recommendation, circuit design, and quote matched to the site.
Specifications
- ✓Fixed green omnidirectional fixtures, flush or semi-flush mounted per ICAO Annex 14 Volume II and GACAR Part 138
- ✓Luminaire safety to IEC 60598, LED source for extended service life
- ✓Sealed housings specified to the ingress protection rating sand, dust, and rooftop exposure requires on Saudi sites
- ✓Compatible with standalone constant current regulator circuits or integration into an existing airfield lighting control system
- ✓Photometric design withstands direct helicopter rotor downwash loading
- ✓Elevated helideck and at-grade pad mounting kits available
Frequently Asked Questions
What colour are TLOF perimeter lights and why?+
TLOF perimeter fixtures are fixed green under ICAO Annex 14 Volume II, chosen so the touchdown and lift-off boundary reads distinctly from other apron, taxi, or obstruction lighting a pilot may see in the same field of view during approach.
Who supplies and installs TLOF perimeter lighting in Saudi Arabia?+
NLS sources TLOF perimeter fixtures built to ICAO Annex 14 Volume II and GACAR Part 138 and delivers them turnkey, design, supply, installation, and commissioning, for helipad and heliport projects across the Kingdom.
Does TLOF perimeter lighting differ on a rooftop helideck versus a ground-level pad?+
The fixture and photometric standard stay the same, but housing thermal rating and seal quality matter more on an elevated deck exposed to direct sun and faster dust ingress. NLS checks these against actual deck conditions rather than air temperature alone before recommending a fixture.
What is the role of the Light Housing in TLOF Perimeter Lights?+
The outer enclosure carries the optical and electrical components and protects them from moisture, dust and impact at the pad edge. Its shape and mounting profile keep the fixture low enough to avoid becoming a rotor or ground hazard.
What is the role of the Optical Lens Assembly in TLOF Perimeter Lights?+
Shapes and directs the light output into the beam pattern required for perimeter marking, keeping the signal visible to an approaching pilot at the correct angle. The lens material and seal also block moisture ingress into the optical chamber.
What is the role of the LED Module in TLOF Perimeter Lights?+
Generates the light output at the colour and intensity specified for perimeter marking. Solid state LED sources give a long service interval compared to older lamp technology, reducing the frequency of relamping at height or at pad edge.
What is the role of the Sealing Gasket in TLOF Perimeter Lights?+
Forms the weatherproof barrier between the housing and lens assembly, keeping the ingress protection rating intact through repeated thermal cycling and washdown. A degraded gasket is a common cause of moisture ingress in perimeter fixtures.
What is the role of the Mounting Flange in TLOF Perimeter Lights?+
Anchors the fixture to the pad surface or edge structure at the height and orientation the layout requires. The flange design allows flush or semi-flush mounting so the fixture does not project into the operating area.
What is the role of the Cable Gland Connector in TLOF Perimeter Lights?+
Seals the point where the supply cable enters the fixture, preventing water tracking along the cable into the electrical chamber. It also provides strain relief so vibration or handling does not stress the internal wiring connections.