The extended lifespan of LED lamps, compared with conventional light sources, is one of their biggest advantages. The expected lifetime of LED lamps under heavy duty use exceed 30.000 hours, equivalent to approximately 10 years. In comparison, a metal halide bulb tends to have a maximum lifespan of 6.000 hours, which is reduced even further under heavy duty operation. A luminaire is considered to have failed at the point in time when the lumen value has depreciated to 70 per cent of the initial lumen value. Therefore, the ‘practical life’ is defined as the period of time between the LED first being activated and the point at which its output falls below 70 percent of its initial output. Buyers should always request evidence of an LED’s lifespan, which any reputable manufacturer will be able to provide.  The tough conditions that light towers will experience in construction and mining applications make durability a key concern. One of the lesser known advantages of LED lighting is that it is less sensitive to temperature variations than many of its forebears. For example, hot and humid conditions do not affect the operation of LED in the same way they might affect a metal halide luminaire. Similarly, LEDs can operate fault-free in low temperatures too.