When lightning strikes

Street, walkway and open-space lighting are currently being retrofitted from conventional to LED luminaires. The advantages of LED include energy efficiency, long lifetime and the removal of out-of-date lamp technologies.

The disadvantage of LED compared to older luminaire technologies is lower surge immunity. This can cause a complete failure of the LED modules, damaging the LED driver or LED module, and can reduce brightness, shorten the lifetime or cause the electronic control system to fail.

Surge protection should be seen as an insurance policy. 
To minimize damage by lightning-caused surges, a well-designed surge protection concept can be incorporated at the project-planning stage or as an add-on to existing installations. It is important to note that surge protection will minimize the number of damaged LED luminaries in the installation, but cannot prevent damage in the area where lightning strikes.

Protection concepts.
Surge protection can be placed directly in the LED luminaire, in the cable junction box at the mast base and/or in the cable distribution cabinets of the infeed. SG uses LED drivers with integrated surge protection at a minimum of 4 kV to protect against surging (SEMP) from the supply installation. Extra surge protection against lightning strikes is available on request.

Surges can be caused by:


SEMP Switching Electro Magnetic Puls
Surges resulting from switching operations, earth faults/short-circuiting or the tripping of fuses.



LEMP Lightning Electro Magnetic Pulse
Indirect lightning strikes which cause conducted interference in the supply line.



LEMP Lightning Electro Magnetic Pulse
Direct lightning strike to the LED luminaire or the supply line.