A card light assembly (10) comprising a generally flat polymeric tray (12) having inner (14) and outer (26) surfaces and a pair of ends, a peripheral rim (16) on the inner surface (14), electrochemical cell-receiving recess (18) in the inner surface (14), and an LED-receiving recess (24) at one of the ends, an annular electrical separator (44) and a disc-type electrochemical cell (30) in the cell receiving recess (18), an LED (36) in said LED-receiving recess (24), the LED (36) having two leads (39, 40), one of which is in abutment with the cell (30) and the other of which is spaced from the cell (30) by the separator (44). A pressure sensitive adhesive label (20) extends over the inner surface (14), and over the cell (30), and is adhered to the housing inner surface (14) to thereby retain the separator (44) and cell (30) within the assembly. At least one of the tray (12) and label (20) is flexibly depressible at the separator (44) and cell (30) for pressing the other lead (40) against the cell (30) to temporarily energize the LED.