Some more notes in bold!

Abhi, would like to make few notes on ur post.

Firstly, u cant use an APE RR on P220 as P220 has got 3 phase alternator and APE's 2 phase, and a new APE RR will cost u around 600/- but u can source it from junk yard too at a lower price. Will someone go for a salvaged RR for new bike?

Yeah, can use the APE RR unit only on a rewinded P220 coil.

Since ur bike is a P220, (forgive me for not reading the whole posts assuing it to be) u dont require any RR change as P220 RR is quite smart enough to feed 2X55W H7 simultaneously! (I have seen some, but not sure how long)

It can feed as it is on DC. But is that sustainable?

How will u get a P220 used coil for rewinding? from scrap? Hardly gets damaged, so only option for a new one. That u can go in for later on if things are going wrong U want to convert a massive 200W to a 250W coil?.Disgusting U dont require at all as its capable of feeding all 2 halos. Max u may need to change to a higher cap RR if it requires.

Where did you get the 250W figure? If it is correct, a 100/90 h/l should be supported w/o any modification.

If u still facing the batt discharge issue, go in for Bulls RR a true 3 phase, will feed a 14AH, but where do u accomodate this 14AH without affecting the bikes overall balance and beauty?

Is the Bull's RR unit any better? A 14ah battery needs a mere 2A current at the maximum to charge. And the bull has this large size battery only because the starter is quite heavy. This has got nothing to do with the rest of the electricals.

Any one can go for the RR swap even with ur stock coil as an ordinary coil is already producing morethan 60W. The idea of changing the RR is boosting the batt charging and coverting it to full DC. A higher watt rewounded coil will produce more amps than the stock coil, but to my observation, its enough for a 35W HID. Halogens? Not at all sufficient with the stock coil. RE WIND

Exactly!

Somehow overlooked your post before!
My answers in bold.

Thanks Bro.
Thanks for cautioning me.
One should be willing to experiment. If it works well and good. If not, thats some time, effort and money spent on R&D.
I would use this setup purely for testing purpose. No long distance touring till the time iam confident that it works without creating any trouble to my FI and Fuel Pump. I would use it only in the city. I wouldnt use it continuously though.

What is this Ape RR unit? Is it the three wheeler mini truck? Is it a direct fit? What about its cost and availability?
It is around 100 bucks. But this is needed after you go for coil rewinding. The stock RR unit will not cope with a rewinded coil.
Will there be some problem if i use the same 9Ah battery and do the mods?
No.
My mechanic advised me to buy an older stator coil and get that re-wounded and keep the stock coil and RR handy to avoid any kind of risks and trouble incase of failure. What should i do?
He is correct.
A car relay. If iam not wrong i'll get it in any car accessory shop. Is there any particular brand or model i need to look out for? What about its cost?
Around 200-400 bucks.
Since mine is an FI model, are there any other kind of risks?
Is there anything else i need to take care of in particular?
Well, basically do not discharge your battery, else the FI unit will not run.
Finally, is the time, effort and risk iam taking worth it?
Yes, if you will not go for HID and still want comparable light.

Mayank, Which typeof HID did you ask the dealer? In 220s you can buy any CAR HID Kit, and plug in.

rahulji,
shop person in nagpur is saying they do not have this type of hid,but they have car hids.......

Thanks Bro.
Thanks for cautioning me.
One should be willing to experiment. If it works well and good. If not, thats some time, effort and money spent on R&D.
I would use this setup purely for testing purpose. No long distance touring till the time iam confident that it works without creating any trouble to my FI and Fuel Pump. I would use it only in the city. I wouldnt use it continuously though.

What is this Ape RR unit? Is it the three wheeler mini truck? Is it a direct fit? What about its cost and availability?
Will there be some problem if i use the same 9Ah battery and do the mods?
My mechanic advised me to buy an older stator coil and get that re-wounded and keep the stock coil and RR handy to avoid any kind of risks and trouble incase of failure. What should i do?
A car relay. If iam not wrong i'll get it in any car accessory shop. Is there any particular brand or model i need to look out for? What about its cost?
Since mine is an FI model, are there any other kind of risks?
Is there anything else i need to take care of in particular?
Finally, is the time, effort and risk iam taking worth it?

Answers in bold.

Edit : I see that you have a FI model. In this case, I would advise you to stay away from the mods unless you want to be stranded on the roads. Atleast, be careful about the load you place on the battery.

I am already running on 9ah Amaron

Bangalore cops wont catch u unless you break a traffic rule And putting HID is not breaking rule.

Phew! Finally some relief. Please bear with a few more of my noobish questions .

U mean to say that without any kind of mods i can run for atleast 1 hour on high rpms(greater than 7k). Am i right?
Yes!
At lower rpms(upto 4k) i would suffer from severe battery drain and gradual decrease in its life. Am i right?
Yes!
If i get a bigger battery(14Ah) and use that without any mods i should be able to run for a longer time(greater than 1 hour). Am i right?
Yes! Possibly!
Now coming to the mods like Re-winding and new RR. Are there any job-quality related issues after i get the coil re-wounded?
Yeah, only get it done by someone who knows what they are doing.
How should i ask the person? Shall i ask him to rewind it to produce 100W+ or something else?
Yeah, more or less.
Is designing a new RR must or my present RR will work? What if my new custom RR fails?
You can use Ape RR unit. That way no need to make any custom stuff.
I would be using this setup only at places where the lighting of either low beam or high beam isnt sufficient to glow the surroundings. In the City, its usage would be very less. Hardly a few minutes in a day combined together all the usage. I dont drive much at Nights on the Highways. Even if i do i would try to make use of High-Beam more than the dual beams. Still is it required to get the mods done?
Not exactly. Try it out for a few days, you would know if it is required. But this set up is clearly not for long distance tours.
What kind of relay should i use? Since the power here is higher than rahuldevnath's case wont the similar relay cause some trouble?
Use car relay. They are rated at more than 100W.
@ Mods-My questions can be compiled and used as FAQ's.

My answers in Bold.

Now my hands are itching. Here is my idea. I want to make both the beams work on my P220 FI. The difference would be that i would use halogens (Osram Night Breakers) instead of HID's. Lack of funds .

If we have a look at the power consumption, it would be like this. 55+55+10+5=125W I can effectively reduce 15W (Pilot lamps and Licence plate lamp). Iam in need of 110W Power.
If i run this setup what are the possible risks? Apart from quick battery drain what other issues would i face?
Lower Battery life too!
I know that the rate at which the battery would discharge is way faster than the rate at which the battery would charge. So i would be left out with a dead battery after sometime.
Any idea how much time a fully charged battery would survive at high rpms(greater than 7k) and low rpms(till 4k)? Will running at high rpms meet the Power demand?
Around 1 hour atleast! Higher rpms will increase the duration. By how much, you find out and let us know!
What are the possible things that must be done to increase the rate of charging of the battery? I know that i will have to get my stator coil re-wounded to generate more power and design a new custom RR unit. But will these two increase the rate of charging of the battery? Apart from these is there anything else that i have to modify?
No!
What if i get a bigger battery? Iam searching for something big. Heard that Bullets have 14Ah batteries. If i use this battery will i be able to run long?
Yeah, only if you give the battery sufficient time to charge. That is, if you do not ride at night all the time.
Also can the same wiring as rahuldevnath did can be applied to my idea?
Yeah.
Iam a total noob to bike's electricals . I would be happy if all the queries are answered.

Thanks & Cheers,
Rahul