You get one(maybe two?) per character you bring through trials, and one per character you bring through the 34 and one for the 35 PoE. Combine that with exotic armor and 42 light armor put on offer by ToO and PoE and hitting 42 and having enough light to max a couple choice legendaries is fairly easy. Once you got a 34 or two or three, then you can spend light on older armor you wanted maxed.