A multi-function replaceable modular LED lamp includes a lamp base, a lampshade, a plurality of LED modules, a power supply control circuit board, and a detector. A frame period of the display device is divided into sub-frames, which have address and light emission periods. The system includes a power conditioning unit and electrical conductors connecting said piezoelectric to said power conditioning unit. The apparatus comprises means for opening a pupil of a test person, in particular a darkened room. These tools allow a developer of an application to use data binding to update data-consuming entities without the need to write custom code.