They are illegal to fit on bikes as it seems
as the tholu was explaining in his rotten English. Not a problem since my low beam is normal halogen and the high beam is HID. In cities I ride with the halogen lamp on, only on highways I pop on the HID (when its really needed >_> not to show off or anything)
Even changing your tyre size needs an approval from the RTO as tyre sizes are fixed for a particular vehicle (if you look at the RC book there's a field for tyre size entry but its never filled). Also add that every vehicle also has a max decibel level fixed for it. Aftermarket parts in general render your car illegal in most parts of the world anyhow. People fit them for performance in the western world while here... they are mostly noobs who don't know what they are doing to their vehicles.
Let's say in India the rules and regulations are seasonal. Whatever they feel like they enforce and then after that it goes
thanda. We'd never realise how many rules actually exist and have a reaction like
"Yeh bhi niyam kanoon ka ansh hai ?!" Its just dependant on the mood of the copper, that'd be all.