The LS Series is specified to start up at a low -25C ambient temperature. The scope plots indicate that a competitor's product tries to start multiple times, succeeding only after several attempts. The upper traces depict the output voltage while the lower traces show the applied AC input voltage with an expanded view on the lower half of the slide. Although choosing a power supply based on price alone is tempting, there are often hidden aspects that may not initially show up. The reputation of the manufacturer is critical for the lowest cost of ownership.