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Battery Powered 4W E27 LED Bulb: Portable 34W Equivalent, 32mA Current & Small Power Source

kosa_pol 7953 11
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  • #1 16769377
    kosa_pol
    Level 2  
    Hello, as in the subject. I would like an ordinary LED bulb like this:

    Power: 4W
    Cap: E27
    Current: 32mA
    Equivalent: 34W

    powered by batteries or some other portable and small power source, but I don't know how to go about it.
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  • #2 16769393
    koczis_ws
    Level 27  
    LED "bulbs" are designed to be powered with 230 V alternating current. If you want to power them from batteries, you need to use a DC / AC converter.
    Of course, you can also dismantle the lamp and connect to the rectifier bridge where there is already direct current, but this is probably not the way.
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  • #3 16769394
    elektryku5
    Level 39  
    The easiest and maybe cheapest version will be to use the 12V version and also a power supply of similar voltage (e.g. Li-ion cells, gel battery).

    It is more profitable than converting the current lamp or adding an inverter.
  • #4 16769397
    kortyleski
    Level 43  
    Nonsense. It will work on DC too. But it's better to look for a 12V LED lamp. Easier to power up.
  • #5 16769400
    Anonymous
    Anonymous  
  • #6 16769475
    koczis_ws
    Level 27  
    kortyleski wrote:
    Nonsense. It will work on DC too. But it's better to look for a 12V LED lamp. Easier to power up.


    First, see what is the internal diagram of the LED lamp on AC 230 V and then write posts. I don't know how you want to pass DC current through a capacitor?

    PS.
    A small fix. There is a parallel resistor discharging the capacitor, but its resistance of several hundred kilohms would require a much higher voltage to ensure the right current and I do not know if it would withstand power.
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  • #7 16769484
    kortyleski
    Level 43  
    Indeed, I did not consider the cheapest ones without a converter. Which does not change the fact that powering the 230V lamp from the battery is pointless
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  • #8 16769516
    koczis_ws
    Level 27  
    Maybe let the author explain why he needs such a thing and then maybe it will be easier to advise something.
  • #9 16769631
    kosa_pol
    Level 2  
    Thank you for your interest in the topic.
    The woman thought that such an "Edison bulb" would be a great decorative element. The idea is that in the "box with cables" he will insert a light bulb, and it will look beautiful ...
  • #10 16769653
    Anonymous
    Anonymous  
  • #11 16769703
    koczis_ws
    Level 27  
    kosa_pol wrote:
    Thank you for your interest in the topic.
    The woman thought that such an "Edison bulb" would be a great decorative element. The idea is that in the "box with cables" he will insert a light bulb, and it will look beautiful ...


    If I'm not mistaken, nobody even dreamed about LEDs in Edison's time :) And I do not recommend the real Edison bulb because it gets very hot.
    Or maybe a fluorescent lamp, once I remember there was even a self-assembly kit for powering the fluorescent lamp from a battery.
  • #12 16769856
    elektryku5
    Level 39  
    Such a lamp is also called "LED filament", I do not see a 12V version in domestic offers, so it is worth checking on foreign websites.

    But does this ornament need to be battery powered? It will be necessary to charge it a bit often, unless it is to shine for a while, if you use Li-ion cells, you will also need a protection (you can buy ready-made PCBs).
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Topic summary

✨ The discussion revolves around the feasibility of using a battery-powered 4W E27 LED bulb, equivalent to a 34W incandescent bulb, with a current of 32mA. Participants suggest that standard LED bulbs are designed for 230V AC and require a DC/AC converter for battery use. A more practical approach is to consider 12V or 24V LED lamps, which can be powered directly from batteries like Li-ion cells or gel batteries. The author clarifies the intention to use the bulb as a decorative element, prompting suggestions for suitable LED filament options. Concerns about heat generation from traditional Edison bulbs and the need for frequent recharging of battery-powered solutions are also raised.
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FAQ

TL;DR: For battery use, avoid 230 V LED bulbs with capacitive droppers (“I don’t know how you want to pass DC current through a capacitor?”); their discharge resistors are “several hundred kilohms.” Choose 12–24 V E27/LED filament options instead. [Elektroda, koczis_ws, post #16769475] Why it matters: This saves you an inverter, reduces losses, and makes a safer, simpler portable light for projects and decor.

Quick Facts

Can I run a 230 V E27 LED bulb directly from batteries?

Not directly. Most 230 V bulbs use a capacitive dropper that needs AC. DC bypasses the reactance, so current control fails. Use a DC–AC inverter or select a low‑voltage E27 lamp instead. As one expert noted, “I don’t know how you want to pass DC current through a capacitor?” [Elektroda, koczis_ws, post #16769475]

What’s the simplest way to make a portable E27 LED light?

Choose a 12 V or 24 V E27 LED lamp rated AC/DC. Pair it with a small 12 V Li‑ion pack or a 12 V SLA/gel battery. This avoids inverters and reduces conversion losses, making the setup compact and efficient. [Elektroda, 139534, post #16769653]

Do I need an inverter for a mains LED bulb on battery?

Yes, if you insist on using a 230 V bulb. A DC–AC inverter creates 230 V AC from your battery, but adds size, cost, and inefficiency. The forum consensus favors switching to a low‑voltage lamp instead. [Elektroda, koczis_ws, post #16769393]

What is an LED filament bulb?

An LED filament bulb uses thin LED strips that mimic vintage filaments and Edison aesthetics. It can be found in E27 forms, and some low‑voltage versions exist, though availability may require sourcing from abroad. For battery packs, include cell protection. [Elektroda, elektryku5, post #16769856]

Is powering a 230 V LED bulb from batteries a bad idea?

It’s inefficient and bulky due to the required inverter. An experienced member summarized it bluntly: powering a 230 V lamp from a battery is pointless compared with using a low‑voltage lamp. [Elektroda, kortyleski, post #16769484]

How do I build a small 12 V battery light with an E27 bulb?

  1. Buy a 12 V E27 LED bulb rated for DC.
  2. Connect it to a 12 V Li‑ion or gel battery through an E27 holder.
  3. Add appropriate charging and protection for the chosen battery chemistry. [Elektroda, elektryku5, post #16769394]

What does the 32 mA on my 4 W bulb mean?

The OP reported 32 mA, likely a label or measurement context. Ratings can be confusing on mains bulbs because internal drivers set LED current. Treat such markings cautiously and verify the lamp’s intended voltage before designing power systems. [Elektroda, kosa_pol, post #16769377]

Will a 230 V LED bulb work on DC if I feed the right voltage?

Not reliably. Capacitive droppers expect AC reactance; with DC, the series capacitor blocks, so current path and regulation are wrong. A large parallel bleeder resistor exists but at hundreds of kilohms, it’s unsuitable for powering the lamp. [Elektroda, koczis_ws, post #16769475]

What socket types should I know besides E27?

Low‑voltage capsule LEDs often use G4 pins instead of threaded E27 caps. If you choose a 12 V G4 lamp, you’ll need a matching G4 holder instead of an E27 socket. [Elektroda, 139534, post #16769653]

Are 24 V E27 LED bulbs a good compromise for decor builds?

Yes. 24 V E27 AC/DC bulbs fit standard sockets and simplify battery packs using two 12 V batteries or appropriate 24 V packs. They offer safer wiring than 230 V while keeping the Edison‑style look. [Elektroda, 139534, post #16769653]

Any safety must‑haves for Li‑ion powered LED projects?

Use a protection PCB for over‑charge, over‑discharge, and short protection. Pair it with a charger designed for your pack configuration. “You will also need a protection” best captures the need in DIY lighting projects. [Elektroda, elektryku5, post #16769856]

Is a real incandescent Edison bulb okay on batteries?

It will light, but Edison‑style incandescents run hot and waste energy. They are poor for portable use and can be a burn hazard in enclosed boxes. Consider LED filament for the same look with far less heat. [Elektroda, koczis_ws, post #16769703]

What’s an edge case where a mains LED won’t light on battery?

Bulbs using a pure capacitive dropper may not light at all on DC. The series capacitor blocks DC flow; only the high‑value bleeder exists, which cannot power the LEDs. [Elektroda, koczis_ws, post #16769475]

Why do people recommend 12 V LEDs for portable builds?

They connect directly to common battery chemistries and need minimal electronics. This reduces size, cost, and failure points versus inverters or driver surgery on 230 V bulbs. [Elektroda, elektryku5, post #16769394]

Can I dismantle a 230 V bulb and feed its internal DC nodes?

You could access the rectifier’s DC output, but it’s discouraged. It’s unsafe, risks shock, and the driver may still expect AC front‑end behavior. Choose purpose‑built low‑voltage bulbs. [Elektroda, koczis_ws, post #16769393]

What’s the best decorative approach for a “box with cables” look?

Use an E27 LED filament bulb rated for 12–24 V and an E27 holder. Hide a protected Li‑ion pack and a charge port in the box for safe, rechargeable operation. [Elektroda, elektryku5, post #16769856]
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