Wow, they certainly have a lot of options. Cool link, omni. As far as I understand it, rooting hormones generally come in three standard concentrations of IBA, .1%, .3%, and .8% (note the decimal/comma in there, it's .8% not 8%). The 'woodier' the plant/stem, the higher concentration of IBA necessary to clone. As far as my crap-ass research has found, .8% is used for woody bushes and tree-like plants, and generally considered too strong for general cannabis purposes, and might actually screw up cloning....but I don't have the experience to say, either way. If I had a particularly woodier strain, and had real troubles cloning, I might try moving up to a .2-.3% IBA formula, but I've personally never had reason to, nor know anything about any of the higher concentration stuff (and I assume you'd have to pay a premium).
Green Light, and most of the popular rooting compounds you will ever hear mentioned regarding cannabis (that use IBA), are all .1% IBA, as far as I can tell. Some products will mix other additives in there, and some don't use it at all, but as far as I can tell it's only necessary at .1% (for marijuana purposes), and as long as it's the only active ingredient listed you can ignore most of the other additives/claims.