It depreciates less than 5% after working 2000hrs, while consumes little power. And another factor is that it's a kind of cold light source with less than 100 temp bulb surface. What's more, the products can reduce hysteresis and magnetic core loss because of its special B-H curve. This  light can work 100,000 hours in that it has no electrodes & filament. And also ,it's a five-year –warranty and Virtually free maintenance-free product.