Luminosity ok - caution depending on the location!

1. luminosity corresponds approximately to a 10W halogen bulb G4 - felt they are even brighter

2. !! caution due to overheating !! A light source is me literally fall apart - all solder joints have disintegrated and on the table lay the parts and remove liquid solder was dropped on the table (!)!
The lamps for days running smoothly but in another (ceiling) light where the lights are mounted freestanding (better ventilation !?). But it could also be a single failure of this lamp. Will continue to test and report.

3. And yet the standard tip for all Halogen Replacement LED Bulb: usually you have to leave because otherwise the LEDs flicker or do not want to light up a single halogen bulb of the lamp. This is how I have taken various reviews ('m just a layman) probably on a required base load of the transformer. So if you do not even want to make a transformer exchange exchanges all halogen bulbs of up to one.

4. Before if possible consider whether the lamps fit into the desired socket. In a lamp they were so deeply submerged that the LED lamps do not fit in as opposed to halogen bulbs.

Because of the good light and the lack of clarity whether the problem described a single case was - for the time being 4 stars