We said in a previous issue that the power supply heat from LED lighting presents design and application implications. But so does the lack of heat.
Consider, for example, lighting on an air traffic control tower in, say, South Dakota. In the winter. Generally, you can’t use LED lamps on these towers because freezing rain can ice them over due to the lack of heat at the lens. Warning lights rendered invisible by ice can lead to disaster. If you had an LED lighting fixture listed for this use, that fixture would have some supplemental heating system to keep the lens free of ice.
Can this issue affect other LED lighting installations? Consider a parking lot in a northern state. It might seem this would be problematic, but such lighting isn’t considered safety-related (in the regulatory sense). And because lights for this purpose are downward facing it’s possible to design a shade that prevents freezing rain from icing over the lens.
Even if an application isn’t safety-related, you might want to avoid using LED lighting or at least have a backup or alternate system (for example, a halogen lamp). An example would the upfacing light of flagpole. Nobody’s going to die simply because the flag on a company flagpole is flying in the dark. But this projects a negative image for the company. Not only is flying an unlit flag at night disrespectful, it violates the U.S. Code, Title 4.
Account for weather effects when considering the lighting technology. They could rule out LED.
Source: Mark Lamendola | Mindconnection