Disclosed is a locking unit to fix a removable cyclone dust collector in a receiving portion of a main body of a vacuum cleaner. Each module shares a common optical axis and each includes an LED at least partially surrounded by an off-axis collimating optic and each projects a radially collimated canted beam towards and onto. In order to connect the device to the continuous flexible bus, at least one piercing connector is used, for example. 5 weight percent Na2O, 0-1 weight percent K2O, 0-2 weight percent Li2O, 0-3 weight percent TiO2, 0-3 weight percent ZrO2, 0-3 weight percent B2O3, 0-3 weight percent P2O5, 0-1 weight percent Fe2O3, at least one rare earth oxide in an amount not less than 0.