Electronic Anti-Collision Light - Acl4

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Part# 11-10678
MFR Model# ACL-4


The electronic anti collision light 4 (ACL4) is a highly innovative product which contributes to saver airspace.

The new LED technology allows an incredibly excellent, red light with only approx. 10% of the input power compared with conventional lights. The casting in a high-optical plastic makes the ACL absolutely insensitive against water, vibrations and other environmental influence. The efficiency of the output is much higher, than with conventional electric light bulbs. The self-warming of the ACL is low and can be determined as safe. To avoid overheating, the heat balance is controlled electronically.

The ACL4 has additionally a serial FLARM-Interface. With this interface (19.200 Baud, 8 Bit, No Parity, 1 Stop-Bit) a PowerFLARM unit can send the emergency level (0-3) and thus control the action replay of the ACL4. Important: connect the shielding of the cable only at the ground of the Power-FLARM to avoid buzz loops and therefore interference.

The ACL4 is part of our energy strategy „Intelligent Synchronisation“. This increases the visibility of aircraft and improves the energy management at once. Available elements of the Intelligent Synchronisation are: EPL2, EPTA-LSA, ELL50, ELL60, ELL80is, ERBis, ERB-His, ERB-SFi, ERB2, ACL4.

This anti collision light for ultra light aircraft is designed to be mounted at a suitable position at the tail unit or at the top of the stabilizer. Please adhere to the following instructions for a professional mounting of the ACL. The illumination angle complies to the regulations for general aviation.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • As worlds first the integrated a FLARM-Interface in an anti collision light for motorized aircrafts in order to increase the visibility and therefore the safety in the airspace. The by the Power-FLARM unit provided signals increase the light pulses and therefore rises the attentiveness.
Intelligent Synchronization
  • The integration of Intelligent Synchronization allows a chronological sequence of power consumption for the connected anti collision lights and prevents battery and generator from becoming overloaded.


  • Color: red
  • Operating voltage: 10 -17 volts D. C., typically: 12.8 - 13.4 volts (on board power supply)
  • Wattage approx.: 10 watts
  • Interface: FLARM and Intelligent Synchronization
  • Diameter: approx. 44mm
  • Height: approx. 39 mm
  • Flange to flange: approx. 61 mm
  • Drill hole: 4,5 mm
  • Weight approx.: 86 gr incl. connecting cables
  • Warranty: 5,000 operating hours or max. 3 years
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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Does the ACL electronic anti-collision light meet the requirements of night legal anti collision lights for experimental aircraft?

Yes, this does meet the requirements for legal flying at night for experimental aircraft.

Q: What are the dimensions and does it come with a mounting bracket? What are the dimensions of the mounting bracket?

The Lights by Thiesen Gmbh have no need for external mounting brackets, or power sources other than, a 12 volt power supply. They merely need a flat surface to mount to, that will support the 2 screws.

Q: Is this beacon acceptable for certified aircraft?

No, this is intended for installation in experimental aircraft only.

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