Lamp Fuel

Part of Alcohol and Distillation

Using distilled alcohol as a clean, renewable lamp fuel for indoor lighting.

Why This Matters

After collapse, electric lighting disappears and nights become dark. The quality of available light directly affects productivity, safety, education, and morale. People cannot read, sew, prepare medicines, or perform surgery by the flickering light of a tallow candle. Good lighting extends the useful day by hours and fundamentally changes what a community can accomplish.

Traditional lighting fuels each have drawbacks: tallow and lard candles produce smoke and smell bad. Beeswax candles are expensive and limited in supply. Vegetable oil lamps work but produce significant soot. Kerosene is excellent but requires petroleum. Alcohol lamps fill a critical niche: they burn cleanly with minimal smoke or soot, produce a bright white-blue flame, and the fuel is entirely renewable from agricultural crops.

An alcohol lamp does not replace all other lighting. For outdoor use and area illumination, oil lamps and torches are cheaper and more practical. But for close work, reading, medical procedures, and indoor spaces where air quality matters, alcohol lamps are superior to every pre-electric alternative except kerosene.

Properties of Alcohol as Lamp Fuel

Combustion Characteristics

Alcohol burns cleanly because its molecular structure contains oxygen atoms, resulting in more complete combustion than hydrocarbon fuels:

Property	Alcohol Lamp	Oil Lamp	Candle
Soot production	None	Moderate-heavy	Light-moderate
Smoke	None	Moderate	Light
Odor	None	Moderate-strong	Mild-moderate
Light color	Blue-white	Yellow-orange	Yellow
Light intensity	Moderate	Moderate-high	Low
Burn time per unit	Lower	Higher	Moderate
Indoor air quality	Excellent	Poor	Fair

The main disadvantage of alcohol as lamp fuel is lower energy density compared to oils. A liter of alcohol provides about 60% the light-hours of a liter of lamp oil. This means higher fuel consumption, which must be weighed against the cleanliness advantages.

Minimum Proof for Lamp Use

Alcohol below about 120 proof (60% ABV) burns poorly in lamps. The water content absorbs heat, reduces flame temperature, and causes sputtering. For reliable lamp use:

• 120 proof (60% ABV): Minimum functional. Flame is dim, may require frequent re-lighting.
• 140 proof (70% ABV): Adequate. Steady flame, moderate brightness.
• 160 proof (80% ABV): Good. Bright, steady flame, efficient burning.
• 180+ proof (90%+ ABV): Excellent. Maximum brightness, clean combustion.

For lamp fuel, there is no need to achieve the very high proof required for engine fuel. Two distillation runs from a standard wash typically produce 75-85% ABV, which is ideal.

Alcohol Lamp Designs

The Simple Spirit Lamp

The most basic alcohol lamp is a reservoir with a wick. It has been used in laboratories for centuries.

Construction:

1. Find or make a small metal or glass container (100-300ml capacity). A small jar, tin can, or metal cup works.
2. Make a wick holder: a small metal tube (5-8mm inner diameter, 30-40mm long) that holds the wick upright and passes through the lid or cap of the container.
3. Thread a cotton wick through the tube. The wick should extend about 5-10mm above the tube and reach to the bottom of the fuel reservoir.
4. Fill the reservoir with alcohol and cap or seal around the wick tube to minimize evaporation.
5. Light the wick tip.

The wick draws alcohol upward by capillary action. The flame burns at the wick tip, vaporizing alcohol as it rises. Adjust brightness by raising or lowering the wick.

The Pressurized Alcohol Lamp

For significantly brighter light, a pressurized lamp vaporizes alcohol before combustion, creating a gas-flame similar to a propane lantern.

Principle: Alcohol is heated in a closed reservoir until it vaporizes. The vapor escapes through a small jet orifice under pressure and burns as a gas flame. This produces a much brighter, hotter flame than a wick lamp.

Construction (simplified):

1. Use a sealed metal container (must withstand internal pressure). A modified tin can with soldered seams works.
2. Install a jet tube: a narrow metal tube (1-2mm bore) soldered into the top of the container.
3. Install a fill cap with a pressure-release valve (a screw cap works; loosen to release pressure if needed).
4. Priming: Pour a small amount of alcohol into a cup at the base of the lamp and light it. This external flame heats the reservoir, vaporizing the alcohol inside. After 1-2 minutes, the vaporized alcohol begins hissing out of the jet and ignites, producing a bright, steady flame.
5. Add a mantle (a small fabric mesh hood treated with metal oxide salts) over the jet for dramatically brighter light. The mantle incandesces when heated by the flame. Even without commercial mantles, a small cage of fine wire mesh improves light output.

Pressure Safety

Pressurized alcohol lamps contain flammable vapor under pressure. Never overfill (leave 25% air space for vapor expansion). Never open the fill cap while the lamp is hot. Always include a pressure release mechanism. Test new designs outdoors.

The Dual-Burner Table Lamp

For sustained reading or work light, build a larger lamp with two wicks for brighter illumination:

1. Use a metal container (500ml-1 liter) with a flat, wide top.
2. Install two wick tubes 3-4cm apart.
3. Add a reflector behind the flames: a curved piece of polished tin or aluminum that directs light forward.
4. Add a glass chimney (a clear glass cylinder or tube) around the flames. The chimney creates draft, improves combustion, and protects the flames from drafts.

This combination, dual wicks with reflector and chimney, produces excellent reading light comparable to a modern desk lamp.

Wick Materials and Maintenance

Wick Selection

The wick is the critical consumable in an alcohol lamp. Good wick material:

• Absorbs alcohol readily
• Burns slowly at the tip without being consumed rapidly
• Does not produce excessive char

Best wick materials:

• Tightly woven cotton (most traditional and reliable)
• Cotton-linen blend (durable, good absorption)
• Fiberglass (does not burn; alcohol burns only at the surface)

Making wicks: Cut strips of tightly woven cotton fabric (old bedsheets, canvas) about 10-15mm wide. For round wick tubes, roll the strip tightly and push it through the tube. The wick should fit snugly but still slide when pulled.

Wick Maintenance

• Trim regularly. After every few hours of use, trim the charred tip of the wick with scissors or a knife. A mushroomed or heavily charred wick produces a dim, smoky flame.
• Soak new wicks. Before first use, soak the wick in alcohol for several minutes to ensure full saturation. A dry wick may not light reliably.
• Replace when too short. When the wick becomes too short to reach the bottom of the fuel reservoir, replace it. Wicks are cheap to make; do not burn them down to the tube.

Fuel Consumption and Economics

Consumption Rates

Lamp Type	Fuel Use (ml/hour)	Light Output	Burn Time per Liter
Small wick lamp	15-25	Low-moderate	40-65 hours
Large wick lamp	30-50	Moderate	20-33 hours
Dual-burner lamp	50-80	Good	12-20 hours
Pressurized lamp	60-120	Bright	8-16 hours

A household using one lamp for 4 hours per evening consumes 100-200ml of alcohol daily, or roughly 3-6 liters per month.

Annual Household Budget

For a single household operating one medium-sized lamp:

Item	Quantity
Alcohol consumed per year	36-72 liters
Honey equivalent (1:4 ratio mead, distilled)	7-15 kg
Sugar beet equivalent	~50-100 kg
Crop area (sugar beets)	~0.01-0.02 hectares

This is a very modest agricultural investment for the lighting it provides. A community of 50 households needs roughly 0.5-1.0 hectare of sugar beets dedicated to lamp fuel, or a proportional amount of any other fermentable crop.

Comparison with Alternatives

Fuel	Cost to produce	Light quality	Availability
Alcohol	Moderate (crop + distillation)	Excellent (clean, bright)	Renewable
Beeswax candle	High (bees + processing)	Good (clean)	Limited
Tallow candle	Low (animal fat)	Fair (smelly, smoky)	Moderate
Vegetable oil	Low-moderate (pressing seeds)	Fair (sooty)	Renewable
Pine pitch torch	Very low (forest gathering)	Poor (very smoky)	Abundant

Safety Practices

Fire Prevention

• Place lamps on stable, fireproof surfaces. A knocked-over alcohol lamp spills burning fuel.
• Keep lamps away from curtains, paper, and other flammable materials.
• Maintain 30cm clearance above the flame.
• Never leave a burning lamp unattended.

Refueling

• Extinguish the lamp completely before refueling. Never add alcohol to a burning lamp.
• Let the lamp cool for at least 5 minutes after extinguishing before opening the reservoir.
• Use a funnel to avoid spills.
• Wipe up any drips immediately.

Extinguishing

• Use a snuffer cap (a metal disc that covers the wick tube and smothers the flame).
• Never blow out an alcohol lamp; this can scatter burning alcohol droplets.
• For wick lamps, pushing the wick down into the tube until the flame is below the tube opening extinguishes it cleanly.

Ventilation

Although alcohol burns much more cleanly than oil or candles, it still produces carbon dioxide and consumes oxygen. In a tightly sealed room, prolonged lamp use can deplete oxygen. Ensure at least minimal ventilation (a cracked window or door gap) when using any open-flame light source for extended periods.

Maximizing Light Output

Several techniques dramatically improve the useful light from an alcohol lamp:

1. Reflectors: A polished metal surface behind the flame doubles the effective light in one direction. Shape a piece of tin into a parabolic curve for focused light.

2. Glass chimney: A clear glass tube around the flame creates updraft that provides steady oxygen supply, prevents flickering, and increases brightness by 20-40%.

3. Light-colored walls: Paint or whitewash the walls of rooms where lamps are used. White walls reflect light and can make a room feel twice as bright.

4. Task positioning: Place the lamp close to the work surface. Light intensity decreases with the square of distance. A lamp at 30cm provides four times the illumination of the same lamp at 60cm.

5. Multiple small lamps: Two small lamps placed strategically often provide better overall illumination than one large lamp.