I've used motorized lifts in some projects but many people are rather shocked by the associated equipment and installation costs.
Considerations include:
- The amount of drop (the vertical travel distance) desired.
- Whether you want two position (typically storage/show or show/service) or three position (storage/show/service) operation.
- The size and weight of the projector.
- The type and degree of control.
- Whether any ancillary items such as plenum housings, ceiling closure panels, emergency release and braking systems, integrated cable management and so on are required or desired.
- If you need the lift to raise or lower within a limited time period.
Chief, Da-Lite, Display Devices, Draper and SVS Lifts all offer some range of projector lift products. The drop and projector size/weight are two of the most critical factors as larger projectors and/or longer drops may eliminate many options.