Fluorescent Lamps Fluorescent lighting is relatively new, being introduced in 1938 and coming into fairly widespread use by the late 1940s. Today it is widely ... One is the rapid-start type, the other is the instant- start; both of these will light up almost immediately when the switch is flipped. ... Ballasts do generate a certain amount of heat, and some of them produce a hum that is clearly audible and can be annoying in a quiet room. ... Thus, a T12 bulb would be 1 1/2 inches in diameter.
|Title||:||The complete handbook of electrical & house wiring|
|Author||:||S. Blackwell Duncan|