... : Installs quickly and easily by just using a screw driveror sticker. CE, RoHS certified. Two-Year ... very expensive, second is some Japanese LED chip, such as Nichial, Toyota etc, but still very expensive. And ... long, even longer than 50, 000hrs. But as stated above, no matter how good quality driver ... while without destroy anything. Thermal manage design: As is known, heat problem is a big problem ...