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  TRAINING DEPARTMENT

College /Polyte

chnic

SyllabusYea

r 

Branch Sem (x) IPT Session ID(xx)

Training Ref Number (xxx)

C 09 E 5 0 5 0 0 1

Special Purpose Lamps

Projector Lamp

 

Lamp in which the luminous element is so mounted that the lamp may be used with anoptical system projecting the light in chosen direction

Projection Lamp

Lamp in which the luminous element is of relatively concentrated form and is somounted that the lamp may be used with an optical system for the projection of either still or motion pictures on a screen

Photo Flood Lamp

Incandescent lamp of especially high colour temperature, often of the reflector type, for lighting objects to be photographed

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Day Light Lamp

Lamp giving light with a spectral energy distribution approximating that of a specifieddaylight

Infrared Lamp

Lamp which radiates especially strongly in the infrared, the visible radiation produced, if any, not being of direct interest

Ultraviolet lamp

Lamp which radiates especially strongly in the ultravoilet, the visible radiation produced,if any, not being of direct interest

Study about Operational condition of the Lamps

Rated Luminous Flux

The value of the initial luminous flux of a given type of lamp declared by themanufacturer, lamp being operated under specified conditions

Rated Power 

The value of the power of a given type of lamp declared by the manufacturer, lamp beingoperated under specified conditions

Life of a lamp

The total time for which a lamp has been operated before it becomes useless,or isconsidered to be so according to specified criteria

Life Test

Test in which lamps are operated under specified conditions for a specified period or tothe end of life and during which photometric and electrical measurements may be madeat specified interavels

Average life

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The average of the individual lives of the lamps subjected to life test, the lamps beingoperated under specified conditions and the end of life judged according to specifiedcriteria.

Lamp Voltage

The voltage between the electrodes of the lamps during stable operating conditions

Starting Time ( of an Arc Discharge Lamp)

The time required for an arc discharge lamp to develop an electrically stable arcdischarge, the lamp being operated under specified conditions and the time beingmeasured from the moment its circuit is energised

 

Study about Components of Lamps

Luminous Element

The part of a lamp which emits light

Filament

Thread like conductor, usually of tungsten, which is heated to

incandescence by the passage of an electric current.

BulbTransparent or translucent gas tight envelope enclosing the luminous

elements(s)

Cap: Base

The Part of a lamp which provides comnnection to the electrical supply bymeans of a lamp holder or lamp connector and ,in most cases, also serves to retain thelamp in the lamp holder 

Pin: Post

Piece of metal, usually of cylindrical shape, fixed at the end of the cap soas to engage in the corresponding hole in a lamp holder for fixing the cap for makingcontact

Lamp holder 

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A device which holds the lamp in position, usually by having the capinserted in it, in which case it also provides the means of connecting the lamps to theelectrical supply.

Main Electrode (of a Discharge lamp)

Electrode through which the discharge current passes after the dischargehas been stabilized

Starter 

A starting device, usually for florescent lamps which provides for thenecessary preheating of the electrodes and, in combination with the series impedance of the ballast, causes a surge in the voltage applied to the lamp

Ignitor 

A device intended, either by itself or in combination with other components to generate voltage pulses to start a discharge lamp without providing for the pre-heating the electrodes.

Ballast

A device connected between the supply and one or more dischargelamps which serve mainly to limit the current of the lamps.

Ballast may also include means for transforming the supply voltage,correcting the power factor and, either alone or in combination with a starting device,provide the necessary conditions for starting the lamps

Dimmer 

A device in the electric circuit for varying the luminous flux from lamps ina lighting installation

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