Paphs need less light than phrags, as a rule. Paphs are considered to be a beginner's orchid and are low-light orchids, only needing two to three hours of filtered light a day. Phrags, on the other hand, prefer up to six hours of filtered light a day.
Watering can be tricky for slipper orchids. The paphs love to stay just lightly moist. If kept too wet, paphs will die of root rot. Phrags prefer much more moisture than a paph. Some hobbyist growers even set their phrags in a saucer of water, not unlike African violets. When the saucer is completely dry, they then add more water to it.
Both paphs and phrags enjoy being potted in a bark or a coconut-husk orchid blend medium. Repot them every spring. Increase the pot size by the smallest increment possible, no more than one inch at a time. While terracotta pots are attractive, they wick water away from the plant. This often causes slipper plants to stress from drying too rapidly.