Lamp-holders are a kind of device which mechanically support a lamp for the purposes of making electrical contact with the lamp. Lamp-holders' power waste is low,and have no affect on environment. Lamp-holders offer a lighting design service for houses and residential property, specialising in energy-efficient lighting. Lamp-holders which are made of flexible, highly transparent, and thermally endurable material, and forms a straight opening to contain a string of Christmas decoration lamps is disclosed.