The energy of the Feng Shui money plants comes from its well-rooted and vibrant energy seen through new growth. Placement of the plants are chosen to hopefully reflect this growing energy in your own bank balance.
Light
Great growth will come from being placed in a position with a great deal of natural sunlight. However the plant will get by in slightly darker places and will even do well in a windowless room (it would obviously need artificial lighting!).
If the sunlight is too harsh or the plants not used to it, then the leaves may take on more of a dark purple colour.
If this is undesired then just move it to a slightly darker area or gradually accustom the plant to more light over time. The purple should fade in time and revert back to the familiar lime green.
Watering
As with most succulents, Jade Plants are tough and adaptable to many situations and a variety of treatments, however they wont last long if you constantly over water.
Water well, then wait for the soil to dry out before doing it again. In Winter you want to give enough to keep the soil just barely moist.
Humidity
No special requirements are needed in terms of humidity.