Product only can be used with incadescent lights. This is as the unit leaks current when in the 'off' position. This will kill a CF very early in its life, defeating the long-life rating of a CF. No mention of this factor anywhere on the packaging until you open it up and look at the technical information packet. Considering most of the US homes today utilize compact fluorescents to some degree, I feel this deficiency of the product to be unacceptable and the fact it's "hidden" from you until you open it up just disgusts me!