My table top flip close Ott lamo is over 10 years old and still on the same bulb! I thing you have to very sure it is an original Ott light. They are expensive, this small table top one was about $60 on sale. So that's six dollars a year and still going strong.
It has a handle so it's easy to carry and use anywhere. The bulb for Ott lamps are about $30.