Can nebdy guide... I js want to know k hwz d intrnal construction of a tube light..?

What exactly are you asking, your sentence structure makes it very hard to understand. Thank you.

Let me Google that for you:

HowStuffWorks "How Fluorescent Lamps Work"

If you've been here long enough you'll catch weird things like a:

I put the golf clubs in the boot of the car.
The hydo meter is runny crazy.
And even "tube light"

I've run into "plug point" and a "for ist" with the accent on the second sylable at work.

Watch the British spellings too.

Forget all above funny answers and try this link
http://www.brighthub.com/engineering/electrical/articles/67646.aspx
I'm sure it'll help