My Ott light bulbs will not fit into a regular socket. They have a special end that only allows them to be used in Ott lamps. Some of the newer model lamps may permit this, but from what I have seen in the stores this is not so. You may be thinking of a Daylight bulb which I believe is not the same quality or clarity as the Ott.
I had an Ott bulb that lasted me 12 years. Three years ago I purchased the current bulb at JoAnn's on sale and ine extra just in case because I live so far from them. Can't go wrong with an Ott.