Quick answer: For a cordless practical light (a lantern, torch, candelabra or period table lamp), use a 12V DC LED flame or filament bulb powered by a 12V battery pack. A 4W flame bulb runs about 24 hours on a 12V 10Ah pack. It doesn't need an inverter or a cable run across the stage, and there's no open flame for the fire marshal to approve.
It's the dress rehearsal before opening. The tavern scene needs a lantern on every table. Candles are off the table because of the fire code. An extension cord across a dark stage is a hazard for the cast, and the battery "LED candles" from the craft store look like LED candles from the craft store, even from row F.
Practical lights are fixtures that actually light up on stage, and props, set and themed-attraction teams run into this problem all the time. The fix is to stop treating the bulb as an afterthought: pick a low-voltage bulb that runs straight off a battery and still looks like the real thing.
Quick reference: which 12V bulb fits which prop?
| Prop or set piece | Bulb type | Base | Nameplate power | Voltage |
|---|---|---|---|---|
| Lantern, torch, brazier, campfire, sconce with an open shade | 12V flame-effect LED | E26 (medium) | 4W | 12V DC only |
| Candlestick, candelabra, chandelier candle | 12V flame-effect candle LED | E12 or E14 | see listing | 12V |
| Period table lamp, floor lamp, desk lamp | A19 LED filament | E26 | 4W or 6W | 12–36V DC |
| Industrial, loft, steampunk or saloon fixtures | ST64 LED filament (clear or amber) | E26 | 4W or 6W | 12–36V DC |
| Marquee, showcase, radio or antique tube lamps | T30 tubular LED filament | E26 | 4W | 12V DC |
| Small globes, string lights, rope lights | G45 LED filament | E26 | 2W | 12–36V DC |
| Small chandelier or candle-style fixtures | C35 LED filament candle | E12 or E14 | 2W | 12–36V DC |
Why use a 12V bulb instead of a household bulb with an inverter?
A household 120V bulb in a cordless prop needs a battery plus an inverter to turn DC into AC. That means more weight, more heat, more noise and something else that can fail mid-show. A 12V DC bulb connects directly to a 12V battery through a socket and a switch, and that's the whole circuit.
It also means the prop's socket is the standard one you already have. The E26 bulbs in this guide use a standard medium Edison screw base and fit a normal lamp socket. The E12 and E14 candle bulbs fit candelabra sockets. You can rewire a thrift-store lamp or lantern for 12V without replacing its socket.
Why not just use real flame?
In most US jurisdictions, open flame in a place of assembly requires approval from the local fire code official. The Minnesota State Fire Marshal, for example, states that theatrical performances using open flame must be approved by the fire code official and comply with NFPA 160. Rules and adopted code editions vary by city and state, so check with your local fire marshal. The practical point is that an electric flame effect avoids that approval process for most productions.
How long will a battery run a 12V practical?
Use this rule of thumb:
Runtime (hours) ≈ battery watt-hours × 0.8 ÷ bulb watts
Watt-hours = battery voltage × amp-hours (Ah). The 0.8 factor leaves a margin so you don't drain the pack flat.
| Battery pack | Usable Wh (approx.) | 2W bulb | 4W flame bulb | 6W filament bulb |
|---|---|---|---|---|
| 12V 2Ah | ~19 Wh | ~9.5 h | ~4.8 h | ~3.2 h |
| 12V 10Ah | ~96 Wh | ~48 h | ~24 h | ~16 h |
These numbers are estimates from nameplate wattage. Before opening night, measure the actual current draw with a multimeter and time a full-charge run with your own pack.
Voltage sag matters too. A battery's voltage drops as it discharges. Lithium packs sold as "12V" can start around 12.6V and fall well below 12V near empty, and a bulb may dim or cut out before the pack is fully drained. Test your specific pack and bulb together through a full show length.
Can I dim these bulbs for a cue?
Not reliably. These 12V flame and filament bulbs are built to hold steady brightness on a varying DC supply, and they can flicker when used with a PWM or DMX DC dimmer. Treat them as on/off practicals: use a toggle switch hidden in the prop, or a wireless relay if the lighting board needs to fire them. If your design needs a slow fade on the practical, use a fixture made for dimming.
Flame bulb or filament bulb?
- Flame-effect bulbs make a flickering, moving flame pattern. The 12V E26 flame bulb has a warm 1300K color that sells the look of fire in lanterns, braziers and wall torches. Choose flame when the audience should believe something is burning.
- Filament bulbs give a steady, warm Edison-style glow. Choose filament when the audience should believe something is electric: a 1920s desk lamp, a saloon pendant, a workshop cage light. For period table and floor lamps, the 12–36V DC LED A19 filament bulb for period table and floor lamps fits a standard E26 socket and runs directly off a 12V or 24V pack.
Mixing the two is a common tell. A "candle" that glows perfectly steady looks wrong, and a flickering desk lamp looks broken.
Which bulb should I buy for a lantern or torch prop?
For lanterns, torches and braziers with a standard lamp socket, the 12V DC LED flame-effect bulb with an E26 base is the direct fit. It's 4W, 12V DC only and screws into a medium socket, so a 12V battery pack and a switch are all it needs. For candelabras and candlestick props, use the E12 or E14 12V flame candle bulb instead.
Outfitting a full production, a themed venue or a haunted attraction? For 20 or more bulbs, ask about wholesale and bulk pricing.
Build checklist for a 12V practical
- Match the base to the prop's socket (E26 medium, or E12/E14 candelabra).
- Match the voltage. The E26 flame bulb is 12V DC only. The filament bulbs listed here accept 12–36V DC. Never connect any of them to 120V.
- Check polarity before connecting the battery.
- Fuse the battery lead, sized for your wiring and total current draw.
- Hide an on/off switch where the actor or stagehand can reach it.
- Leave airflow around the bulb. LEDs run far cooler than halogen or incandescent bulbs, but don't pack the bulb in foam or fabric.
- Do a full show-length burn test on a fully charged pack.
FAQ
Can I power a 12V flame bulb from a 9V battery? No. The 12V E26 flame bulb is rated for 12V DC only. A 9V battery won't reach its operating voltage, and a single 9V battery has very little capacity in any case.
Will a 12V filament bulb work on a 24V battery system? Yes. The A19, ST64, G45 and C35 filament bulbs listed here are rated for 12–36V DC. The 12V flame bulb and the T30 tube bulb are 12V only.
Do 12V LED flame bulbs get hot? They draw about 4W, so they run far cooler than a halogen or incandescent bulb. Keep normal clearance from fabric and foam, and never enclose the bulb completely.
Can I control 12V practicals from the lighting board? You can switch them on and off with a wireless DC relay. They are not designed for smooth dimming and may flicker on a PWM/DMX dimmer.
How many bulbs can one battery pack run? Add up the bulb wattages, then use the runtime formula above. Four 4W flame bulbs (16W total) on a 12V 10Ah pack run roughly 6 hours. Size your wiring and fuse for the combined current.
Do I need fire marshal approval for LED flame effects? Electric flame effects generally avoid the open-flame approval process, but your local fire marshal has the final say on anything on stage. Confirm early in the production.
Related guides
- Why Choose Flaming Effect Bulbs for Landscaping?
- Are There 12V Light Bulbs With a Standard E26 Base?
General information only. Always match the bulb's base, voltage and wattage to your fixture and power source, follow the battery manufacturer's instructions, and confirm stage and venue requirements with your local fire code official.