Circline Bulbs Page

Circline light bulbs provide a bright, cool white light, and the circular shape of these bulbs is what sets them apart from similar bulbs in the industry. They are designed for specific light fixtures that require circular shaped bulbs and four-pin bases. What’s more, a variety of powers and tube diameters make these a versatile lighting option for the right applications.

How Circline Fluorescent Bulbs Work

Circline bulbs work the same way that other fluorescent bulbs work. The tube contains a mercury-vapor gas that is excited by an electric current to produce ultraviolet light. The ultraviolet light causes the phosphor coating inside the light to glow, turning it into useful, visible light.

The tube, which in a regular fluorescent light is a straight tube, is curved in a circline light. One side of the bulb contains a four-pin base, which allows the user to fit the bulb into the lighting fixture.

Common Uses of a Circline Bulb

Circline light bulbs are often found in home lighting situations because of their compact size and high life expectancy. These bulbs work well in fully enclosed fixtures where compact fluorescent bulbs may get too hot — a problem that shortens the life of the bulb.

Types of Circline Style Light Bulbs

Circline bulbs are rated based on the diameter of the circle, measured in inches, and the T value, which is the diameter of the tube itself measured in eighths of an inch. For example, a FC15T9 circline light has a 16-inch diameter and a bulb that is 9/8-inch thick. T5, T6 and T9 bulbs, in diameters ranging from 6 1/2 to 16 inches, are available. They are also available as double-tube lights, which provide an increased light output without an increased overall diameter.

Choose Lightbulb Wholesaler for Circline Fluorescent Bulbs

If you are in the market for circline style bulbs, Lightbulb Wholesaler has a large selection for your consideration. With industry-leading technology, such as Sylvania's Pentron, these bulbs are highly efficient and have a long expected lifespan. Contact Lightbulb Wholesaler today and our experienced customer service representatives will help you select the circline lamp that best meets your needs.