A support assembly includes a plurality of support arms coupled to a pole or tower structure. The connector of the present invention has a high vibration resistance, stable phase, quick connection, small SWR and good stability and is convenient for use. The chamber has a narrowing region and is operable to be pressurized. The emission control face has a planar outline shape which is anisotropic around optical axis L, thereby causing value of \u03b85 \u03b81 to have a change depending on direction angle \u03c6 around optical axis L, with the result that highly uniform light is supplied to a required anisotropic irradiation range.