This system uses Light-Emitting Diodes instead of the more traditional halogen incandescent – or halogen – lights. Incandescent lighting will soon be obsolete, due to higher energy use coupled with a short life span for the bulbs, especially in outdoor conditions.
Having to replace landscape lighting every month as the bulbs fail is a real chore. LED systems eliminate this headache, or at least postpone it for possibly decades.
LED lights will supposedly last 40,000 hours. Some have ten year guarantees, or more. If you run your lights four hours every single night of the year, that translates to 27 years without ever having to change a bulb.
Not that you could change a bulb, since the trend is to make the fixture and light source integral – so there’s no bulb to change. This is not the most ecological decision, since it means that you’ll have to throw away the fixture and replace it at some point in the future – but it’s not as bad as it might seem, since LED lights use only a fraction of the energy required by incandescent systems.