MOCK Q.402-With reference to the Halogen Light Bulbs, consider the following statements :

MOCK Q.402- FRAMED FROM "The Hindu"

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Q. With reference to the Halogen Light Bulbs, consider the following statements :

1. White coating also known as Phosphor coating on the glass absorbs UV light & protect from the UV rays

2. They have the same tungsten filament as the typical incandescent light bulbs

3. Fluorescent coating is often used in these bulbs to add brightness

Select the correct answer using the codes given below :

A) 2 & 3

B) 1,2,3

C) Only 2

D) 1 & 2

Ans. C

Fluorescent bulbs : White coating also known as Phosphor coating on the glass absorbs UV light & protect from the UV rays

Vapour lamps : Fluorescent coating is often used in these bulbs to add brightness

A halogen lamp, also known as a tungsten halogen, quartz-halogen or quartz iodine lamp, is an

incandescent lamp consisting of a tungsten filament sealed into a compact transparent envelope that is

filled with a mixture of an inert gas and a small amount of a halogensuch as iodine or bromine.

The combination of the halogen gas and the tungsten filament produces a halogen cycle chemical reaction

which redeposits evaporated tungsten to the filament, increasing its life and maintaining the clarity

of the envelope. For this to happen, a halogen lamp must be operated at a higher envelope temperature

(250° C; 482° F)[1] than a standard vacuum incandescent lamp of similar power and operating life; this

also produces light with higher luminous efficacy and color temperature. The small size of halogen

lamps permits their use in compact optical systems for projectors and illumination. The small glass

envelope may be enclosed in a much larger outer glass bulb for a bigger package; the outer jacket will

be at a much lower and safer temperature, and it also protects the hot bulb from harmful contamination

and makes the bulb mechanically more similar to a conventional lamp that it might replace.

Standard and halogen incandescent bulbs are much less efficient than LED and compact fluorescent lamps,

and have been banned in many jurisdictions because of this.