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Many early Christmas bulbs were shaped to look like what they had replaced: the classic Christmas tree candle. The candle shape fell out of vogue, and in time new varieties shaped like glass balls, animals, lanterns and Santa figures hit the scene. A new and improved candle-shaped bubble light re-emerged later on in the 20th century. This one was filled with percolating colored liquid that cast a flickering light on the tree as the bulb grew warm.

That's a good thing. But virtue has its price. LED illumination has a different optical quality -- so different that some Christmas-lovers feel it is sterile and devoid of any warmth. LED-skeptic Christmas buffs who want to give their tree a real glow have been boxed in by a lack of choices -- but persistence pays in the end.

Say the idea of an environmentally friendly, candle-powered Christmas tree appeals to you, and you've decided you "won't take LED for an answer." You would like to get off the grid and go candle this year.

This is simply a matter of taste. There's no right or wrong. The classic Clip On Candle Holder is a popular solution. It clamps on to the branch and has a swivel mechanism so you can adjust it. The Clip-On Christmas Tree Candle Holder is usually available in silver or gold.

The fit is crucial, so it's not worth cutting corners or trying to substitute another kind of candle. The candle really has to be snug in the base of the holder for safety reasons. Birthday candles are too thin. Dining candles, tapers and many pyramid candles are too thick.