Hach, I do not know well. Consumption is of course phenomenal with 3.5W. But the light? I still can not get used to 100% so me currently. Compared to 50W lamps of big long corridor is (lit up with 4 of these lamps) total now slightly darker, but it is nevertheless a very different "light color" that somehow "unnatural" to me / "aggressive" / "artificially" / " sterile "/" diffuse "acts. Better I can not describe it, it is now just unusual ...