Are LED light units long lasting, and are they expensive to replace?

Question

I saw a flashlight that uses 3 LED lights, and I wondered what is the lifespan of the LED?

Answer 1

I lowered my stairwell ceiling and placed an LED lighting in it, in the mid 80s and I have not changed the bulb since, granted its not on as regular as room lights, but yes used every day at least 2 or 3 times. So yes they are a good buy for lasting.

Answer 2

Regular light bulbs are a thin, glass bottle with no air in it. When you turn on the light, the electricity causes the the filament (the curly piece of wire in a light bulb) to heat up and glow. This heat will eventually cause the filament to crack, thus your light bulb goes out.
Here is a really good explanation of how/what an LED is made of. It gets really techy, but you'll get the idea:

http://en.wikipedia.org/wiki/Light-emitting_diode

Most LED's have a lifespan that typically reach THOUSANDS of hours, use less electricity (saving you on costs of batteries, home electric bill).

Answer 3

LED lights are small, and use very little energy. They last a LONG time. Ive had an LED flashlight on my keychain that uses a watch battery for two years, and still havnt had to change the battery.

Answer 4

The life of an LED is upwards of 100,000 hours, twice as long as the best fluorescent bulbs and twenty times longer than the best incandescent bulbs.

An LED also produces more light per watt of consumed power than a regular bulb.