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Thiesen Electronics L.E.D. Red Aircraft Anti Collision Light (ACL4)

Thiesen Electronics L.E.D. Red Aircraft Anti Collision Light (ACL4)


ACL4 – for fuselage or vertical stabilizer installation

The technology carries on – so we developed the new ACL4 for you. With LEDs of the newest generation we were able to boost the brightness of about 50%. Simultaneously we reduced the power consumption remarkably. This makes an efficiency enhancement of about 100%!

As a matter of course all our LED position lights / ACLs are water and seawater resistant. Since the electronic parts are completely integrated in the ACL4, no black box or other items are needed.

Like all our other ACLs, the ACL4 is completely sealed in high grade optic plastic. As all electronic components are in the ACL4 integrated, there is no additional place needed.

The extremely bright, red sequencing light flash has a beacon angle of 360° and is visible at 30° below and above the horizontal plane.

For easy connection, the ACL is already provided with a 1,5/0,25 mm² four-wire-cable. It can be installed on the fuselage or vertical stabilizer by its flange footing and some additional silicone.


As worlds first we integrated a FLARM-Interface in an anti collision light for motorized aircraft in order to increase the visibility and therefore the safety in the airspace. The Power-FLARM unit (supplied separately) provided increases the light pulses frequency and therefore raises the visibility of your aircraft.  PLEASE NOTE: You will need to purchase an additional ‘Power-FLARM’ unit to operate the FLARM functionality.  Swish Projects does not supply these units.  The FLARM unit duplicates most functionality that you would get from the Levil ADSB-In feature, but adds the additional flashing light function.

Intelligent Synchronization

The integration of our well proven Intelligent Synchronization allows a chronological sequence of power consumption for the connected anti collision lights and prevents battery and generator from becoming overloaded.



Aircraft anti collision beacon.  Made in Germany.

The main difference between the Rotating Beacon and the Anti Collision beacon is the physical size of the unit is shorter, and the lighting pattern is an instantaneous 360 degree strobing effect versus the ‘light bar’ rolling around the circumference of the ERB2.  Both units will do effectively the same job, and both look amazing.

Eye protection is definitely recommended if you are too close to these lights.  They will leave you praising Jesus, walking into stuff and seeing red spots for about 5 minutes (ask me how I know).

Mounting Instructions ACL4

Wiring Diagram

The main point of difference between the Thiesen Electronics products versus other manufacturers (such as Whelan or AeroLED) is the moulded plastic resin that is used to completely enclose the Thiesen lights.  NOTHING will ever get onto your LED lights with this system.  There is no lens to crack, no gaps to allow water or salt air in and corrode your lights.  I think they compare favorably on price and you get a 3 year factory warranty.

Additional information

Weight 0.085 kg
Dimensions 6.1 × 4.4 × 3.9 cm


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