Bubble light

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This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Bubble light" – news · newspapers · books · scholar · JSTOR (July 2025) (Learn how and when to remove this message) This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (February 2017) (Learn how and when to remove this message)

(Learn how and when to remove this message) Common screw-in bubble light A bubble light is a decorative device consisting of a liquid-filled vial that is heated and illuminated by an incandescent light bulb. Because of the liquid's low boiling point, 39.6°C (103.3°F), the modest heat generated by the lamp causes the liquid to boil and bubble up from the vial's base thus creating a decorative effect.

[edit] A candelabra base 120-volt bubble light candle in operation The liquid is almost always methylene chloride, a toxic solvent. It is generally sealed in a glass vial or capsule to prevent its release; if it is broken, the area should be evacuated until the fumes have dissipated. Some early bubble lights instead used a lightweight oil or camphor (a white substance used in some mothballs) to create the low boiling point. In these older lamps, one can often see a white piece floating at the top of the vial, until the heat of the lamp dissolves it and it starts to bubble. The light from the lamp illuminates the bubbles from underneath, causing them to shine. Bubble lights of all kinds operate best when the top of the tube is significantly cooler than the bottom, thus increasing the temperature gradient. The tubes must be kept upright, and occasionally may need to be tapped or even shaken to begin bubbling after warming up.

[edit] This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (September 2025) (Learn how and when to remove this message) Bubble lights have been made in two different lamp base sizes—E10 (C6) 15 volt, and E12 (C7). The original design used a miniature screw base (E10), such as those used on C6 cone-shaped Christmas lamps. For 120 V power, these early designs were nominally designed to operate with eight on one string, in series, at 15 volts each. However, they were often packaged with a nine-socket string to extend the life of the bulbs. Bubble lights could also be purchased individually for use in existing light strings. Modern incarnations either use candelabra base (E12) 120-volt bulbs, or push-in wedge base "midget" size miniature bulbs (most commonly ten 12-volt bulbs wired in series). The clear light bulb is enclosed in a plastic base made up of a "bowl" and a "cap", usually of different colors. Bubble lights are manufactured in just about any color, including the liquid in the tube. The plastics used are most commonly semi-opaque red, yellow, blue, and green. Liquids are generally amber, red, blue, green, and rarely, purple or pink. Uncolored liquid is also available, being lit with colored bulbs instead. In recent years, bubble lights have become more elaborate in appearance. Glitter is sometimes added to the vials for extra sparkle, most commonly on specialty types such as those used in decorative nightlights. Bases are now often made to look like figures such as Santa Clauses or snowmen, or decorative objects and symbols, rather than the plain ribbed plastic. Like many other Christmas decorations, they have been converted for Halloween use, usually with orange-colored liquid and a base that looks like a jack-o'-lantern, or the head of a black cat or witch, among other Halloween symbols. Less-toxic modern imitations of bubble lights are made from acrylic or other clear plastic rods, with permanent bubbles deliberately manufactured into them, lit with fixed-color or color-changing LEDs. Other bubbling lights are much larger and sit on a table or floor, occasionally with fake fish which "swim" up and down as they change buoyancy. These tubes are usually filled with distilled water, and have one or more airstones at the bottom, and normally a light, along with an air pump.

[edit] A Christmas bubble light, as depicted in a drawing in U.S. patent 2,353,063 Bubble lights for Christmas decoration were first patented in the United States by Carl W. Otis in 1944 and introduced there in 1946 by NOMA, one of the largest American manufacturers of Christmas lights. While NOMA was the largest company to make these lights, other manufacturers included Raylite (Paramount/Sterling), Royal Electric Company, and Good Lite/Peerless. Bubble lights were very popular as Christmas lights from the 1940s through the 1970s, before miniature "fairy" lights became popular.

[edit] US Pat. No. 2,353,063: July 4, 1944 US Pat. No. 2,031,409: February 18, 1936 US Pat. No. 2,031,416: February 18, 1936 US Pat. No. 2,162,897: June 20, 1939 US Pat. No. 2,174,446: September 26, 1939 vteLightingConcepts Accent lighting Color rendering index Color temperature Electric light Glare Light fixture Light pollution Hawaii Hong Kong Lightbulb socket Bi-pin lamp base Edison screw Luminous efficacy Task lighting Methods of generationIncandescent Regular Edison Halogen Nernst Luminescent Cathodoluminescent Electron-stimulated Chemiluminescent Electrochemiluminescence Electroluminescent field-induced polymer Fluorescent Fluorescent lamp (compact) Fluorescent induction Photoluminescent Laser headlamp Radioluminescence Solid-state LED lamp Combustion Acetylene/Carbide Argand Campfire Candle Carcel Diya Flare Gas Kerosene Petromax Lantern Fanous Paper Limelight Luchina Magnesium torch Oil Qulliq Rushlight Safety Tilley Torch Electric arc Carbon arc Klieg light Yablochkov candle Gas discharge Deuterium arc Neon Neon lamp Plasma Sulfur Xenon arc Xenon flash High-intensitydischarge (HID) Mercury-vapor Metal-halide ceramic Hydrargyrum medium-arc iodide (HMI) Hydrargyrum quartz iodide (HQI) Sodium vapor Stationary Reflector Ellipsoidal reflector Multifaceted reflector Parabolic aluminized reflector (PAR) Aviation obstruction Balanced-arm lamp Chandelier Emergency light Gas lighting Gooseneck lamp Intelligent street lighting Light tube Marine aid to navigation light Nightlight Neon lighting Pendant light Recessed light Sconce Street light in the US Torchère Track lighting Troffer Portable Bicycle lighting Flashlight Mechanically powered Tactical Glow stick Headlamp outdoor Lantern Laser pointer Navigation light Searchlight Solar lamp Automotive Automotive light bulb types Daytime running lamp Headlamp hidden high-intensity discharge sealed beam Rear position lights Reversing lights Safety reflector retroreflector Stop lights Turn signals trafficators DisplayDecorative Aroma lamp Blacklight Bubble light Christmas lights Crackle tube DJ lighting Electroluminescent wire Lava lamp Marquee Plasma globe Strobe light TheatricalCinematic Floodlight Footlight Gobo Scoop Spotlight ellipsoidal reflector Stage lighting instrument IndustrialScientific Germicidal Grow light Infrared lamp Stroboscope Tanning Related topics Battlefield illumination Bioluminescence Laser Light art Luminous gemstones Signal lamp Sources Reflected

Bubble lights have a nostalgic glow that instantly signals “Christmas” without shouting. The gentle clink of bubbles rising in a coloured liquid mimics the soothing fizz of a warm drink, adding a tactile, kinetic element that static LED strips lack. Their modest heat—just enough to stir the liquid—creates a low‑key ambience perfect for a living‑room centerpiece or a Victorian‑style tabletop display. Because they run on a standard screw‑in bulb, they slot easily into existing sockets, making them a plug‑and‑play tradition that families can pass down. The effect is subtle enough not to overwhelm, yet distinctive enough that guests will notice and comment, reinforcing the seasonal mood without the flash of modern extravagance.

When buying a bubble light, check that the vial is sealed with a clear, colour‑stable liquid; cheap reproductions can turn cloudy after a few seasons. Look for a base that accommodates a standard E14 or E27 bulb—this ensures replacement bulbs are readily available and you can opt for lower‑wattage or energy‑saving versions if you prefer. Placement matters: keep the unit away from drafts and direct sunlight, as excessive heat can cause the liquid to over‑boil and leak. Once a year, gently dust the glass with a soft brush; never submerge the whole lamp. If the bubbling slows, replace the bulb with a slightly hotter one, but avoid high‑wattage bulbs that could over‑pressurise the vial.

Many assume bubble lights are a modern novelty, but they first appeared in the 1930s as a luxury Christmas item, long before LED ribbons. Another myth is that they’re a fire hazard because they contain liquid. In reality the liquid’s boiling point is just above 100 °F, so the heat generated is modest and the glass enclosure is designed to withstand the pressure. The real risk lies in using an over‑powered bulb or placing the light on combustible surfaces. Finally, some collectors think the colour of the liquid indicates rarity; while pastel shades were original, today’s manufacturers often use the same formula, so colour alone isn’t a cue to age.