The fluorescent lamp in common with most electrical devices may cause a certain amount of radio interference. This interference may be caused due to one of the following factors: 1. Direct radiation from the bulb to the antenna. This effect diminishes rapidly as the radio is separated from the lamp. Thus, for example, at a radius of 2.8 metres interference [...]
In this article we will discuss about:- 1. Principle of a Gaseous Discharge Lamp 2. Types of Gaseous Discharge Lamps 3. Drawbacks. Principle of a Gaseous Discharge Lamp: The basic principle of a gaseous discharge lamp is illustrated in Fig. 7.32. Gases are normally poor conductors, especially at atmospheric and higher pressures, but application of suitable voltage, called the ignition [...]
In this article we will discuss about the determination of candle power of a lamp. Use of Polar Curves to Determine the Candle Power of a Lamp: It is assumed that the luminous intensity or the candle power from a source is uniformly distributed over the surrounding surface. But none of the practical type of lamp provides light uniformly distributed [...]
In an arc lamp electric current is made to flow through two electrodes in contact with each other which are drawn apart. The result is an arc being struck. The arc maintains the current, and is very efficient source of light. There are various forms of arc lamps such as carbon-arc, flame-arc or magnetic-arc lamps. Type # 1. Carbon-Arc Lamp: [...]
In this article we will discuss about:- 1. Filament Materials Used in Incandescent Lamps 2. Filament Dimensions of Incandescent Lamps 3. Types 4. Aging Effects 5. Effects of Voltage Variations. Filament Materials Used in Incandescent Lamps: For sometimes the arc lamps were used for general lighting purpose but as the carbon-arc lamps were complicated so these have been superseded by [...]