I bought 3 of these products for a ceiling. The power of 1W was what I wanted, that is to say around 20-25W, and the size is consistent. The problem is that they remain switched off with switch, depending on the luminaire or you install them. And finally, they have a period of 6 months more !!! Certainly they are not expensive, but the LEDs bulbs are supposed to minimum 15,000 hours (15 years for use of 3 hours per day / year). Also delivery was very long. I do not recommend this at all.