Television Production And Lighting Instruments:

There are four basic kinds of lights used in television.
 These May be
i. spot lights(with narrow beam it casts well-defined shadow)
ii. broad lights( wider beam and casts a softer shadow)
iii. flood lights (broad illuminated circular pattern with a diffuse shadow)
iv. soft lights (almost it doesn’t cast shadow)

The intensity and beam spread of spots and some other lights may be adjusted by moving the lamp forward or back in the lamp housing. When the beam is narrow and intense the lamp is "spotted down." When the beam is wide and more diffuse the lamp is "flooded out.” All lamps have not this adjustment.
Barn Doors:
Most lamps are fitted in a globe having "barn doors," which are black metal flaps fastened. These flaps are used to keep light from falling where it's not wanted. Mostly these are used on backlights, which can cause objectionable lens flare if their light falls the camera lens directly.
Scrims Disks:
Scrims are special disks of screen wire that are used to soften lights and it reduce light intensity slightly too. Different full or half scrims can be used to produce variables soften effects in the scene easily. Scrims can also be used in lamps as a protective grid against bulb explodes.
Bulbs:
Tungsten-Halogen bulbs are used for television lamps commonly. These bulbs don’t lose their brightness and correct color temperature throughout their lives.
Fitting Stands:
These are used to fastened fitting of the lighting used in the production.Barn doors are most of time are the parts attach on these stands.

Power Consumption
Television lights use much power during their usage. They range from 25 watts for DC camera lights up to as high as 5000 watts. Lights used for electronic news gathering (ENG) or electronic field production (EFP) normally ranges from 500 to 1000 watts each.