I was looking for a LED for Ausrausch of 20W 12V AC halogen lamps, which are plugged into so small reflectors shells - so so typical false ceiling lamps. I hope you understand what I mean. Unfortunately I could not find anywhere documented, whether those things fit in there, so I bought it were at risk. Result: they fit, they are bright enough and have a nice white color. As I looked forward! - Important Note: I betrreibe the lamps directly to a 12VAC power supply, which is exactly where what the Halogenfunzeln were connected. And it works! Occasionally, however, I wiedere notice a slight flicker, which certainly comes from the AC voltage (AC means alternating current!). If you read the product description, you will find out that AC is considered improper voltage. So Do not be surprised if your LEDs flicker or "age" if you do it that way. Better and properly is to use a 12V DC power supply! (Such a thing is offered for little money) - unfortunately I get my 12V AC power adapter not ran, to expand it, so I'll leave it at that and hope that the LEDs that absorb ...