Virtually all conifers want sun......full sun if at all possible. Planting them in more shade than they are happy with will typically result in leggy, extended growth (called etoilation) and sparse foliage. And because the plants will be stressed from lack of sunlight, they will be prone to other problems, like pest or disease issues. Yews (Taxus sp.) are one of the few conifers that will tolerate a lot of shade.