"I had 11 12v MR16 downlights in my kitchen taking 35w each. I decided to change to 7w led's instead. Most were ok with existing transformers but a couple flickered. I swapped the original transformers for these and this solved the flickering problem. There's no difference in the brightness but I have noticed that these two take a fraction of a second longer to light up. It's not worth the expense and time to change the rest !"