Methods are described for fabricating NAND-type EEPROMs without field oxide isolation. The lighting fixture includes a support member with an internal cavity and a first locking member, an electrical socket removably received within the cavity of the support member, and a modular light assembly having a light source and a second locking member that is releasably enagable with the first locking member in response to the relative rotation of the first and second locking members. A 16-QAM signal constellation can be used, for example, for transmitting at low data rates.