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Tealights are a popular choice for accent lighting and for heating scented oil. A benefit that they have over taper candles is that they do not drip. [2] Tealights may be set afloat on water for decorative effect. Because of their small size and low level of light, multiple tealights are often burned simultaneously. Longer-burning tealights may be called nightlights. They are also lit for religious purposes.VarietiesAdvent labyrinth made with 2,500 burning tealights at the Holy Cross - Centre for Christian Meditation and Spirituality, Bornheim, GermanyTealights can come in many different shapes and sizes, small and large, as well as burn times and scents. However, tealights are commonly short and cylindrical, approximately 38 mm (1.5 in) in diameter by 16 mm (0.63 in) high, with white unscented wax.A standard tealight has a power output of around 32 watts, depending on the wax used.[3]When used in larger batches, such as at a party, the two criteria most desired are "least amount of smoke" and being long-lasting.[4]Cup designThe wick is tethered to a piece of metal underneath to stop it from floating to the top of the molten wax and burning out before the wax does.Tealights have been protected under several patented designs. In some cases, the standard tea light metal cup has been replaced with a clear plastic cup, sometimes made out of polycarbonate plastic. The clear cup allows more light to escape the holder. However, the metal cups are much more common.HoldersHeart-shaped tealight candle holder from Himalayan saltWhen not placed on a tray, tealights are placed in a special holder, which may be pierced[5] or have partly clear walls to allow light to pass through.From small pockets of glass, metal, ceramic, and other materials to larger, more elaborate tea light lamps, holders come in a wide range of styles, colours, and shapes. They have an appropriately sized cup to use a tealight candle, either scented or unscented. Discount stores, gift stores, and home decor stores often carry an array of holders for these small candles.ElectricalElectric tealights have become increasingly popular as newer technology becomes available. They can feature incandescent or LED bulbs, the latter becoming the preferred format as LEDs become more-efficient and brighter. They can come in many different colours to set a mood, match a decor or augment the container's design. Some can also simulate a moving flame with various mechanical or electronic animations.Electric tealights are not useful as a source of heat, so they are not suitable for chafing dishes or other food warmers.SafetyThe use of tealights may be prohibited by safety regulations, such as in hospitals.[citation needed]Electric tealights are much safer than a flame-based tealight, and can be left unattended, as there is no open flame or heat to worry about. This allows them to be placed inside freestanding lace structures, or in candle holders made from paper, wood or other flammable materials. They can also be made much smaller to fit where a large flamed-based tealight cannot.