Because LEDs are not made of glass and are hollow inside, they are far less fragile than both fluorescent and incandescent bulbs. This makes them much more durable, less likely to be inoperable due to being dropped, and can withstand harsh conditions. Because LED lights are resistant to shock, vibrations and external impacts, they make great outdoor lighting systems for exposure to weather, wind, rain or even external vandalism, traffic related public exposure and construction or manufacturing sites. For freezer rooms and iceboxes, they are the perfect bulbs.