New Circlarc Fluorescent Lamp

The 18-watt, 12-inch, T8 Circlarc fluorescent lamp is a standardized curved fluorescent lamp made in the form of a half circle 12 inches in diameter. Used singly or in multiple arrangements, it provides a flexibility of application not obtainable with the full-circle (Circline) lamp. The arc stream of each lamp is short so it may be operated directly from the 110- to 125-volt alternating-current lighting circuit with a small low-cost choke as a ballast or from 110- to 125-volt direct-current circuits with special auxiliaries. The semicircular shape makes it possible to obtain, with a curved fluorescent lamp, the advantages of mass-production machinery previously available only with straight-tube lamps. — The lampholders required must provide a preheat and an operating circuit and must allow a tolerance for variation in lamp diameter and base-pin location. A spring support at the center of the lamp holds it in place. The ballasts must develop proper electrical values to operate the lamps at designed wattage without excessive loss or overheating. — Lamps mounted on walls and ceilings provide pattern lighting using a production lamp. Bare-lamp clusters provide new novelty for suspended fixture design. The half circle simplifies design, installation, and maintenance of built-in lighting with curved fluorescent lamps. Portable lamps and other fixtures with several Circlarc lamps now can be provided with multilevel fluorescent lighting.

Print ISSN

0097-5834

Published

1948-06

Content type

Information

DOI

10.5594/J12585