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1. What is the head lamp light bulb type of a 2011 Subaru Legacy 2.5i wagon (i.e: H1, etc) ?
2. Can these light bulbs be changed to a HID type (white light) without any electrical system modification ? (currently they are Halogen type according to the Specs)
3. If answer to Q2 is 'Yes', any recommended workshop ?

Depending on the headlights fitted to the vehicle there could be a number of possibilities - specifications vary. I suggest you call a Subaru parts department with the rego number so that they can advise the bulb type according to the vehicle's VIN number.

Please refer to the following extract from the VIRM regarding the fitment of an HID bulb kit as you have mentioned:

A high-intensity discharge (HID or Xenon HID) conversion kit consists of an HID bulb with a high voltage power output or ‘ballast’ which fits into the original headlamp unit in place of the original bulb with no change to the headlamp lens, reflector or housing.

It is illegal to fit an HID conversion kit to a vehicle as it brings the headlamp out of standards compliance by producing poor beam patterns and light that is far too bright to be safe. The bulbs can also produce light that is noticeably blue and not the required substantially white or amber colour. Vehicle and headlamp manufacturers do not permit this modification, and these kits cannot be LVV certified.

For more information please refer to the VIRM .