Light quality is good, comparable to a 20 watt halogeen variant. Build quality is poor. Out of the box all worked, but 3 out of 5 were defect after 5 minutes burning, Fixed them by myself: the cable was not soldered correctly inside the lamp. On my halogeen transformer these lamps did not work correctly, the halogeen trafo could not handle the led load. With one halogeen lamp all other led lamps did work correctly. These lamps works at best i guess with a 12 volt DC transformer, not with a halogeen transformer.

Light quality is good, comparable to a 20 watt halogeen variant. Build quality is poor. Out of the box all worked, but 3 out of 5 were defect after 5 minutes burning, Fixed them by myself: the cable was not soldered correctly inside the lamp. On my halogeen transformer these lamps did not work correctly, the halogeen trafo could not handle the led load. With one halogeen lamp all other led lamps did work correctly. These lamps works at best i guess with a 12 volt DC transformer, not with a halogeen transformer.

Light quality is good, comparable to a 20 watt halogeen variant. Build quality is poor. Out of the box all worked, but 3 out of 5 were defect after 5 minutes burning, Fixed them by myself: the cable was not soldered correctly inside the lamp. On my halogeen transformer these lamps did not work correctly, the halogeen trafo could not handle the led load. With one halogeen lamp all other led lamps did work correctly. These lamps works at best i guess with a 12 volt DC transformer, not with a halogeen transformer.