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4 Volt Emergency Light Bulbs – Low-Voltage Lamps for Exit Signs & Emergency Lights

4 Volt Emergency Light Bulbs are specialized low-voltage lamps used in select exit signs, emergency lighting fixtures, and remote head units. These replacement bulbs are designed for 4V battery-powered systems, most commonly found in compact or vintage emergency lights. Every lamp in this category is UL 924 compliant and supports NFPA 101 emergency egress standards.

  • 4 Volt

These 4V replacement lamps are most often used in smaller thermoplastic emergency lights, surface-mounted exit signs, or sealed remote heads. Choose from incandescent and LED options depending on your fixture’s compatibility. If your emergency system uses a sealed 4V lead-acid battery, these are the lamps designed to match. All models are rated for emergency use and meet the 90-minute illumination runtime requirement under UL 924.

Upgrading your entire fixture is also worth considering—especially if your current unit is outdated or underperforming. For completely power-free alternatives, check out our ambient light-charged exit signs or maintenance-free glowing signage powered by tritium gas.

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✅ Buying Tips for 4 Volt Emergency Bulbs

Here’s what to look for when shopping for a 4V replacement bulb:

  • ✅ Match the Voltage: These bulbs are for 4V systems only. Using them in a 6V or 12V fixture will result in poor performance or damage.
  • ✅ Check the Base Type: Common options include wedge-base and screw-base bulbs. Be sure to inspect the existing lamp before ordering.
  • ✅ Choose the Correct Wattage: Stick with the wattage specified by your fixture to preserve battery runtime and ensure compliance with NFPA 101.
  • ✅ LED vs. Incandescent: Some 4V models have LED equivalents, offering longer life and better energy efficiency—perfect for retrofits.
  • ✅ UL 924 Certification: Every lamp here is tested for emergency use and is compliant with current life safety codes.
  • ✅ Consider Power-Free Alternatives: Tritium and photoluminescent signs provide illumination without electricity or bulbs.

FAQs About 4 Volt Emergency Light Bulbs

Where are 4V emergency bulbs used?

They're typically found in compact emergency lights and older exit signs that use sealed 4V battery packs. These systems are less common today but still used in many commercial buildings.

How do I know if my fixture takes a 4V bulb?

Check the fixture label or battery—if it’s a 4-volt sealed battery, the lamp must match. You can also look for markings on the old bulb indicating voltage and wattage.

Are these bulbs UL 924 compliant?

Yes. All 4V emergency bulbs listed here are UL 924 certified and designed for use in code-compliant emergency fixtures.

Can I upgrade to LED?

If your fixture supports it, LED equivalents can offer longer life and improved battery efficiency. Just be sure to match the base and voltage exactly.

What happens if I use the wrong voltage?

Using a 4V bulb in a higher-voltage fixture can burn it out instantly. Always match the voltage and wattage to your system’s specifications.

Are there fixtures that don’t use bulbs?

Yes. Tritium signs and non-electrical glow signs offer egress marking with no lamps, batteries, or wiring. They're ideal for low-maintenance applications.