AC/DC Utility LED Bulb FAQs

Most frequently asked questions regarding AC/DC Utility LED Bulb

Common Questions Regarding The Emergency AC/DC Utility LED Bulb

Learn about VCC’s LED utility bulb and how they work

Core Capabilities

Meet the dual-action AC/DC Utility LED versatile enough for demanding applications, including infrastructure, transportation, power plants, refineries, walkways, water treatment facilities, and emergency backup lighting.


1. Is VCC’s LED Utility Bulb a true dual voltage AC/DC lamp?

Yes, our AC/DC LED can operate in both AC and DC environments without having to rewire or make any additional adjustments. Unlike others who claim to be dual AC/DC but actually require additional steps to transition from one input to the other, VCC’s bulb was specifically developed by our team of experts to deliver reliable performance with either input, as well as toggling between the two with no effort.

ac dc emergency bulb


2. How does VCC’s LED dual AC/DC LED bulb work?

Our team of engineers designed and developed the bulb to overcome the obstacles associated with dual voltage operation. The 9W AC/DC Utility LED bulb uses special circuit topology to accommodate both input types. 

Should an outage or power failure occur, the AC/DC Utility LED will seamlessly transition between the power grid and DC sources such as batteries or a generator.

3. How bright is the AC/DC Utility Bulb — 9W doesn’t seem like enough?

While the bulb only uses 9 Watts, it has a luminous flux of 980 lumens, which is more than enough to illuminate tunnels, power plants, and other areas where emergency backup lighting is needed. It actually shines much brighter than a 100W incandescent.

ip61 a21 emergency led bulb incandescent

4. What kind of base does the AC/DC Utility Bulb have?
VCC’s Dual AC/DC Utility LED uses a standard E26 base, which means retrofitting incandescents with LED technology is as simple as screwing in a new bulb into the existing fixture. No tools are required.

ip61 a21 emergency led bulb e26 retrofita21 emergency led bulba21 emergency led bulb

5. What are the size and shape of VCC’s Utility Bulb?

VCC’s AC/DC Utility LED Bulb uses an E26 base, so it can fit perfectly into a socket with a standard sized screw base, making it ideal for replacing incandescent fixtures.

The bulb is size A21, which refers to the overall shape of the bulb. A21 is one of two standard bulb sizes, with measurements of  2.6225 inches in diameter and 5 inches in height. 

An A19 bulb is 2.375 inches in diameter and 4.13 inches high. 

Depending on the measurements of your jelly jar or fixture, the AC/DC Utility LED Bulb could also replace your A19 lamps with E26 bases.

vcc ip61 a21 a19 emergency led bulb size

6. VCC’s AC/DC bulb doesn’t look like an LED. Why is that?

The bulb includes a diffused lens that helps evenly disperse the light when illuminated. Similar AC/DC alternatives include a clear lens, so the LED is visible, but so are hot spots. VCC’s AC/DC LED does not have hot spots.
ip61 a21 emergency led bulb

7. Which incandescent bulb does VCC’s AC/DC Utility LED replace?

VCC’s direct incandescent replacement is designed to effortlessly upgrade a standard 100W incandescent bulb with an E26 base. The bulb is A21 in size, but could also work as a direct incandescent replacement for 100W A19 bulbs as long as the lamp will fit into the dimensions of the fixture.

low maintenance ip61 a21 emergency led bulb

8. Why does the 9W AC/DC LED seem brighter than the 100W bulb it replaces?

There are multiple factors that contribute to the 9W AC/DC Utility LED looking brighter than the 100W incandescent it replaces:

Color temperature – VCC’s LED has twice the color temperature of a standard 100W incandescent — 5000K vs. 2500-2700K.

Bulb design – without a filament to burn out, LEDs only put out a fraction of the heat incandescents do. Incandescents also lose a lot of infrared light, which is why they need more power. All of these elements add up to more light from the LED being seen by the naked eye than when viewing an incandescent.  

Less wattage required – an LED requires a fraction of the power compared to an incandescent, with the equivalent being: 100W incandescent = 9-10 W LED.

vcc ip61 a21 emergency led bulb incandescent

9. How does the operating life of VCC’s AC/DC bulb compare to that of a standard incandescent?

Incandescent light bulbs operate for typically 1,000 hours. And when they go out, they completely fail due to a burned out filament. 

Conversely, LEDs do not contain a filament that will burn out. Their light degrades over a long lifespan. For example, VCC’s AC/DC LED is rated for 50,000 hours to 70% of its output.

ip61 a21 emergency led bulb long life

10. What makes VCC’s AC/DC Utility Bulb ideal for emergency applications?

There are several reasons why VCC’s AC/DC Utility Bulb is the perfect solution for emergency lighting, power plants, refineries, transit, parking garages, and more:

  • Dust and water-proof: an IP61 rating ensures water droplets and dust cannot impede the performance during critical situations or power outages
  • Vibration-resistant: because the bulb is solid-state, it can withstand shock and vibration
  • Extended bulb life: an operating life of 50,000 hours means VCC’s AC/DC Utility bulb delivers reliable illumination during dangerous situations
  • True dual AC/DC operation: designed by experts to seamlessly switch from the grid to battery or generator backup

ip61 a21 emergency led bulb water treatment plantip61 a21 emergency led bulb parking garages

11. What is fold-back circuitry and how does it work?

Fold-back circuitry is used to limit the total output of a constant-voltage power supply to a device. This approach reduces the current and voltage as the device goes into overload.  

If a load increases beyond its rated value, the voltage folds backward via the short circuit and reduces the load, ultimately protecting the overall circuit and device.

led fold back circuitry 

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