... detect people or car to turning light on/off., when no body, the light will turn off or keep 30% lighting, and when ... , tunnel ,corridor, schools, factory, hotels, building projects and so on. Details:Product Series Item NO.WattLengthluminous(Lm)DimensionBST-668MM-20W20W668mm2775 ... warranty period,BESTER company will provide free new products based on the proof-documents.2. If failure or damage due ...