Happened to me is that I do before buying read over, and then it came to problems with my lamp, in which I wanted to replace the existing halogen lamps - with LEDs it came again and after a few minutes to the fact that they flickered like a strobe as if you quickly switch the lamp on and off. In the lamp there are 3 lamps, when I began the old one (35 W), it worked with the remaining 2 LEDs, which makes plausible that there is a problem of reduced power transformers. Now I have to start looking for a LED transformer, I somehow have to be installed in the lamp myself. Had I known that before, I would have bought the same a new lamp. I find it very inconvenient that you have to replace the transformer in a lamp possibly to use the lamps can. Especially you can not test it before buying.
The light intensity is somewhat weaker than the previous 35Watt halogen lamps. The room is equipped with the LED less bright. So I would appreciate the intensity of the 25W-30W halogen lamps. In the product name states "3.5W = 45W" in the description "3.5W = 40W" - the provider seems at ease himself not to be quite sure how bright the light is on. But even the lower specification of 40W is for my test just unfortunately too high.