LED  is one of the few technologies available today that will have a direct positive impact on environment. LED is also with a few benefits

Long life – lifetimes can exceed 100,000 hours, as compared to 1,000 hours for tungsten bulbs
Robustness – no moving parts, no glass
Size – typical package is only 5 mm in diameter
Energy efficiency – up to 90% less energy used translates into smaller power supply required
Versatility – available in a variety of colors