All of the different lighting systems respond in various ways to temperature.  LEDs are no exception.  LEDs like the cold, in fact the colder the better for their light output and length of life.  LED's in meat freezers, deli cases and beverage coolers do very well.  On the other hand LEDs do not light the heat.  One of the main reasons for the premature failure of LED's is excessive heat damaging the driver.  With this in mind manufacturing facilities where there can be high temperatures because of equipment or, commercial kitchens with heat from ovens, exterior lighting on a hot roof are all examples of where the LED will not experience its full light output or life.  As with all lighting systems the environment it will be functioning in needs to be a major consideration to be sure that you choose the appropriate one and are able to maximize the life and quality of light output.