A tungsten halogen lamp includes a light transmissive envelope, which encloses a tungsten filament and a gaseous fill comprising an inert gas and a halogen-containing gas, such as an alkyl halide. In a high pressure discharge lamp of a lamp unit, a dielectric member is on the outer surface of a first sealing part. The grain size of each adhesive powders is small enough to remain the pores without obstructing permeability. The blade trigger includes a cavity and is coupled to the housing. If the stresses, strains, forces, andor moments are not optimized, a new orthodontic treatment is proposed and the process is repeated. The vacuum cleaner includes a hose clamping unit capable of protruding outside the cleaner body or retreating back to the cleaner body according to a mode change of the vacuum cleaner.