My experience with light tires, Schwalbe Racing Ralph, turned out to be not so good. For the trails I ride with rocks, roots, and thorns, I quickly learned that lightweight tires are not durable enough for me. Kept getting flats, could not trust the tires would hold air more than a day or two. Eventually I got to the point where I became annoyed with the RR rear tire and pitched it in place of a Continental X-King which was much better, but not as reliable as the Geax Suguaro tires currently on my IP-057.
The Suguaro tires are a bit heavier but work well on a variety of trail conditions and have 120tpi construction which gives the tire a very pliable characteristic, nice on the hard tail because it allows just that little bit more ride compliance.