I bought an H4 bulb for my swift dzire 2008 type 1 diesel , no change of wiring needed, we can use it with relay or with direct connection, but better use it with relay. They will give you two led bulbs with resistor in it.
Box contains :
1 pair of LED bulbs
Two double side tape - to affix the resistor side ways
One manual
Some black wire tags
Fitting ring
A warranty card
The most important thing is
High beam - only White colour
Low beam - White and Warm white colour
There is no high beam for yellow (warm white)
Brightness wise , it is ultimate,nothing to say about it
Changing colour is by simply on and off the Headlight switch.
But only low beam colour can be changed