The dimmer with integrated pressure-changing switch came ruckzuck - unpacked and connected. Bulbs can be dimmed betw. 0% + 100%. My Segula E27 LED thus settled not dim it takes apparently NEN Phase and not the more complex phase dimmer, but can not for the dimmer, retrofit LED need it anyway for the brand new Osram E27 superstar August came 2013 on the market is (10W, 806 lm). Well, and can be dimmed between a homogeneous and Armutslichtchen max, ie 1 W -. 10 W (plus own consumption dimmer with about 1 W.). Even the max. Power (=> luminous flux) can be limited by set screw on the dimmer. Only alone the removal of the control wheel is really hard. The best bet is from either side of the control wheel via a narrow, flat knife blade under the iris and levers the wheel gently upwards. Conversely, this has the advantage, the wheel will probably fall hardly accidentally, unless one overexcited it by force. Dimmer + Osram LED / bulb make the way throughout, determined Range no humming or buzzing sounds and the LED does not flicker, eventually falling below the 10% comes from soft. For 11 incl. Shipping an unbeatable value for money and I forgive 5 Stars.