This is amazing.I now have my house wired for 12 volt electric lights and the saveings on my electric bill is amazing.There perfect.

Bought two of these...used them in a solar backup system in a room. Used one for over 6 months without any problems. The other one I bought was used for a month when it blew a drive transistor internally. After a quick inquiry on google to get the transistor type and ratings, I headed to the local Radio Shack and bought the closest available component as well as two more sets in the event of future blow-outs. Getting the case apart left the case slightly blemished but changing the blown part was easy and straight forward. The good bulb that has been in service without blow-out gets quite warm, leading me to believe that these transistors are driven too hard to not have any heat sinking. So along with the repair of the blown transistor I added small aluminum heat sinks. This fixed the problem. Overall, typical product from China but looks good and works, just don't use in really hot environments (ie. +90 deg F).

Bought 4 of these for a solar system. ONLY used them in one socket, withing 4 days, 2 were already blown. They do not handle fluctuting DC voltages such as those seen in a solar system. No built in regulation. I've use many items for years off the 12v solar that are sensitive equipment; to include Cell Phones, external Hard drives, and a wireless cellular repeater. So, in a nut shell, a waste of money!