Give reason why the glow increases in CFL bulbs with the passage of time
Answers
CFL bulbs are one of the most commonly used light sources in our households.
When we turn off any CFL bulb ,it still glows slightly,due to the vapour deposition inside the bulb.
But the light output starts becoming dimmer over the time passage,due to the lack of vapour deposition inside the bulb,there is no such phenomenon where we see that the CFL bulb is becoming brighter,over the time passage.
First thing to get acknowledged is that no light bulb will glow brighter in its old age.
There are two main reason for why an old light bulb emit low brightness than the new one.
They are Electrical Factor and Optical Factor.
The electrical factor.
The metal tungsten which we are using in the light bulb will keep evaporating to the temperate. Even though Tungsten has an ability to survive in high heat, they are metals after all. Every metal melts when get contacted with heat. In this case, Tungsten evaporates day by day. If we increase the voltage to the tungsten, it will evaporate soon. If we kept increasing the voltage, then there will be no more tungsten left to burn. It will poofff out.
The optical factor
At the high temperature, some atoms of the Tungsten filament will leave from its surface in form of water molecule. Do you remember what I said before? “Tungsten will evaporate”. The water molecules that leave the surface will get settled on the inside surface of the glass. This evaporated water molecules will reduce the radius of the light’s brightness over time.
In the case of CFL light bulbs the vapor deposition inside the bulb makes it to glow dimmer when time passes.
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