For the 20 W halogen I have bought this W 4 LED spotlight GU5.3 base and am very happy with it. The LEDs are much brighter than the halogen lamps, warm white color a pleasant brightness. Possibly you have to adjust the electronic transformer's, which require a minimum consumption load, otherwise it may start flashing. Was with me in the bathroom where 5 lamps are required. But that is indeed written everywhere. I will also convert definitely all other halogen in the house yet. I highly recommend this LED spotlight very wonderful :)