Paraphals need much more light than Phals. They have terete leaves like terete vandas that also need a a lot of light. They also need warm to hot temperatures. This particular hybrid will grow with good light probably full sun and warm conditions depending on the kind of renanthera parent, because renantheras come from from both cool and warm regions. However attractive the plant is, I do not think it is ideal for a windowsill culture or even appartment or basement culture unless you are ready to provide supplemental lighting.