This is a great light, but ..... Due to the more predominantly pos. Rez. I've bought this light, because I lay with all other above 11W with my dimmers have failed. These went to about 1 hour from its own. But the problem is my old Gira touch dimmer. He needs a certain base load No matter what I've tried Osram, Phillips or other nix went clever I now have my stehlampe rebuilt on doppelflammig and thus the base load increases. With 2 light of these I have now more than 2000 lumens and my old dimmer is working properly. !!!