LED lighting is increasingly replacing legacy light sources (mercury vapor, metal halide and sodium vapor) in outdoor applications as a result of technological revolutions in LED efficiency (higher lumens per watt), secondary optics (better lenses/reflectors), and greater thermal dissipation.
However, the initial cost of installing outdoor LED lighting can be substantial; this cost is justified and payback is established based on the lower wattage demand, lower maintenance cost, and longer lifetime it offers. In order to protect outdoor LED lighting from failing within an investment payback period of about five years, the lighting must offer high durability and reliability.
Transient surge events in AC power lines, which can damage lighting fixtures, represent a significant threat to outdoor LED lighting installations. Indirect Lightning-Induced Surge When nearby electrical equipment is switched on or off, over-voltage transient surges can occur in AC power lines. Nearby lightning strikes can also generate transient surges in AC power lines (Figure 1), especially in outdoor environments...
For a full version, you can download the attached file.