The invention provides a Christmas lamp bulb, including a lamp bulb, wherein the structure and shape of the wire lead terminal are in accordance with the inner hole of a conventional lamp socket; that is, the inner end of the wire lead terminal is a cylinder terminal with a shape of cylinder, whereas the outer end of the wire lead terminal is a rectangle terminal with a shape of rectangle. The D-mannitol shows improved compressibility and is useful as an excipient. According to this method, it is possible to easily set an appropriate charging time for each photodiode and yet prevent the photodiodes from becoming saturated. Individual planks within the flooring system may comprise at least one partial sub-panel having a decorative motif andor embossed surface texture that is complementary with a pattern of a neighboring partial sub-panel or plank. This device comprises a removable cartridge that can be fitted onto the device and removed independently of the handpiece and comprising the first and the second reservoirs. The mask for an exposer having a left and right light intensity deviation includes a substrate; a first pattern in a middle of the substrate; and second and third patterns on left and right sides of the first pattern, respectively, wherein the first and second patterns compensate for the left and right light intensity deviation of the exposer.