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The entire LED assembly is coated in an acrylic, silicone or other clear material to protect the entire assembly. Illumination grade LEDs are typically affixed to heat sinks to help dissipate excess heat and preserve LED life. This overall design is extremely durable and resistant to damage from materials degradation, vibrations and shocks. Since no materials are actually burning or being heated to skylt & dekor very high temperatures as with an incandescent lamp, the LED has an extremely long operational life often measured at 50,000+ hours. If you drop an LED on the floor, it will likely continue to operate without any discernable change. Not so for a glass covered light bulb. This durability is the second biggest reason for the popularity of LEDs with boaters. Switching to LEDs means that a boater will likely not have to replace another light for 5 years or more. This means that although LEDs may cost more initially, the savings in maintenance and replacement costs easily offset this outlay.