On the Light-Fix website we endeavour to refer to as many terminology's as possible; one of the common parts with various names is the candle tube.
This part is to cover the lamp holder, hiding it from view and gives the illusion of a candle, imitating the style of candle chandeliers.
Some of the most common names are shown below:-
candle tube, candle sleeve, candle cover, candle covers, candle sleeves, candle tubes, lamp holder covers, decorative lamp holder covers, lamp holder sleeves, chandelier candle covers, chandelier candle sleeves, drip effect candle tubes, gothic candle sleeves, shabby chic candle sleeves, chandelier sleeve holders
To match the many names here at Light-Fix we stock over 50 varieties of candle tubes; if you wish to discuss height customisation our sister site King's Chandelier Services Ltd overs a customisation service on certain candle tubes
The video "how to measure a candle tubes for your chandelier and wall lights" offers advice on choosing the size and style.