I have two overhead light fixtures which have tubes similar to the Ott light florescent tubes. I believe they are called daylight. They are slim bulbs and require a special fixture. The bulbs are smaller in diameter than a regular florescent
bulb. They are energy saving. I got them at Home Depot. Have a look at the Ott website for plenty of information about their products. Joanne's frequently has 50% off on all Ott lights.