In the realm of modern rechargeable lighting, with a focus on bulbs, you might find yourself wondering about the inner workings behind their functionality. Perhaps the question arises: how do they manage to operate even in times of power outages? Our endeavor is to delve into the mechanics of these illuminating sources, comprehensively expounding on their structure and the mechanism allowing them to persevere when the usual electrical supply is absent.

how rechargeable bulb work

Stick around as we embark on a journey to unravel the intricacies of these light sources, equipping you with the knowledge to effectively integrate them into your domestic environment.

Before We Start: What are Rechargeable Light Bulbs?

To kick things off, let's familiarize ourselves with the concept of rechargeable light bulbs. Essentially, these bulbs closely resemble standard LED bulbs in terms of their external appearance. While there might be a slight variation in overall size, they maintain the same fundamental form as regular LED bulbs.

What truly sets them apart is their unique ability to persistently function even in the face of a power outage, provided that the light switch remains in the "on" position. Operating in this backup mode, the duration of illumination varies depending on the specific type of rechargeable bulb, ranging from 2 to 8 hours (with practical expectations typically falling within the 2 to 4-hour range).

Interestingly, once the power is restored, the rechargeable bulb continues to remain lit; however, it transitions into a self-recharging mode. This mechanism ensures that the bulb replenishes its energy reserves for future use.

How Can They Work During Power Outage?

surge emergency light bulb

To put it simply on the start, they have a built-in lithium-ion battery, which is in charge of providing power to light for a couple of hours, simply as that. But there are some other differences in terms of components that are in charge of proper working. 

Rechargeable LED bulb contains: 

  • Embedded LED Chip
  • Operational Driver (responsible for converting AC power to DC while also lowering the voltage to 12 or 24V)
  • Lithium-ion Battery (serving as an alternative power reservoir for instances of power interruption)
  • Controller Driver (tasked with seamlessly shifting between AC and battery power sources while also overseeing the battery's effective charging process)

An Ordinary LED Bulb Contains:

  • Embedded LED Chip
  • Operational Driver (responsible for transforming AC power to DC, additionally reducing voltage to 12 or 24V)
  • E26/E27 Socket (links the AC power line to the driver, facilitating power supply)

As noted earlier, a rechargeable LED bulb encompasses a compact battery and controller driver or inverter circuit. In the event of power disruption, the inverter circuit seamlessly transitions the bulb's operation to rely on battery power. 

Important to note: You may notice that the illumination of the light source when running on the auxiliary battery may be a little weaker compared to its performance on the main power line.

Consequently, the LED bulb operates without interruption, drawing power from the battery until the primary power supply is reinstated. Subsequently, once power is restored, the inverter circuit facilitates the switch back to the primary power source. This ingenious mechanism empowers the LED bulb to maintain its illuminative function, effectively operating as an emergency light during instances of power outages.

Utilizing Rechargeable LED Bulbs in Your Household

The primary and foremost utility of these illuminants lies in their efficacy during power outages and similar unforeseen circumstances, as they are skillfully designed to cater to such scenarios.

Now, a noteworthy attribute pertains to the inclusion of a cap or attachment mechanism that either comes integrated within the bulb or is provided separately in the packaging. This cap resembles a light socket and can be affixed to the bulb's base. This innovative feature empowers the bulb to function independently of the power grid, effectively transforming it into a portable flashlight.

This versatility extends to scenarios like navigating a basement lacking built-in lighting, where you can hang the bulb for hands-free illumination. These screw-on caps are equipped with a built-in switch and a hook for secure attachment. This offers you an array of possibilities to establish a portable light source anywhere within your abode, even in outdoor settings.

For instance, during balmy summer nights, you can suspend it under a parasol, near the grill, on the backyard porch, or in any other location that strikes your fancy.

Optimally, you could have a lamp ready to accommodate this specific type of LED bulb. In times of need, it's as simple as extracting the bulb and carrying it along to fulfill your task, rendering it a truly versatile solution.

Charging Time for Emergency Bulbs

As previously discussed, these rechargeable LED bulbs come to the rescue during power interruptions, with an anticipated runtime of 2 to 8 hours. However, it's more realistic to count on a duration of 2 to 4 hours, which remains quite commendable.

Regarding the charging process for these specific LED bulbs, several factors come into play that collectively influence the charging duration.

These factors encompass:

  • Battery Capacity: The intrinsic capacity of the battery itself.
  • Charging Rate: The rate at which power is supplied for charging.
  • Battery State: Whether the battery is partially charged or fully depleted.
  • Battery Health: The age and condition of the battery affecting its charging capacity and overall lifespan.

In general, rechargeable LED bulbs feature a deliberately slower charging rate, a choice that bears positive implications for the longevity of the battery and curbs the risk of overheating within the bulb.

In terms of a complete charge cycle, you should anticipate a span of 2 to 8 hours for the bulb to achieve full charge. It's worth noting that certain bulbs might necessitate additional time, particularly if they boast a sizable battery capacity or a lower charging rate.

When it comes to charging, the process is remarkably convenient as there's no necessity to remove the bulb from its light fixture. The majority of these bulbs are engineered for self-charging, eliminating the requirement for an external charger (albeit they do need to remain within a light socket). As power is reinstated subsequent to a power outage, the bulb seamlessly transitions back to drawing power from the main supply. Simultaneously, it initiates an automatic recharging sequence, allowing the entire process to unfold effortlessly.

Recharging While the Light Switch is Off

In simple terms, the answer is NO. When the light switch is in the off position, it effectively interrupts the power supply to the bulb, consequently stopping the flow to the charging board. To facilitate the recharging of the bulb, it necessitates functioning akin to a conventional light bulb, drawing power to ensure proper recharging. This also implies that if the bulb isn't used on a regular basis, which could occur in scenarios where certain rooms' lights remain off, the bulb might not accumulate sufficient charge to operate effectively or for a substantial duration during power outages, as it won't have been fully recharged.

Lifespan of Rechargeable LED Bulbs

Significant differences do indeed exist when assessing the lifespan of rechargeable LED bulbs as opposed to regular LED bulbs. Typically, standard LED bulbs offer a lifespan spanning from approximately 20,000 to 50,000 hours. In contrast, rechargeable LED bulbs showcase a lifespan ranging from 10,000 to 20,000 hours. It's worth noting that there are instances of higher-quality bulbs exceeding expectations, extending their durability to approximately 25,000 hours. Despite this variance, rechargeable bulbs still present a commendable lifespan, notably surpassing that of traditional incandescent light bulbs.

In search of an ideal rechargeable emergency bulb? Discover the Emergency LED Bulb by Surge—an energy-efficient, economically viable, power-preserving solution. This LED light is impeccably suited for your household, ensuring that darkness doesn't encroach even in the face of power interruptions. Additionally, feel free to explore our comprehensive guide on the finest emergency light bulbs available.