http://www.silkroadforums.com/viewtopic ... 706#743706
This guide will tell you what the damage difference of fire is vs light. Also you will benefit a lot from the physical damage increase from fire.
Light does not cause you to crit more. It is a myth.
Where Garms for speed and pvp against nukers. Protector will give you more physical defense. Its your decision either would be fine.