Can an LED Light bulb that is made to run on AC, still run on DC?

I'm wondering if taking an LED Light bulb that is meant to go in the ceiling of a house (made to run on AC) and sticking it on a battery, will it still work? Will it be just as bright on a 12 or 24V battery as it would be in a 230v ceiling of a house? I would assume it has a rectifier and the DC current should just pass through and light the LED's am I correct?

NachoMahma6 years ago
.  Probably not, but I don't really know how LED lightbulbs actually work. As steveastrouk hints at, there's more than one way to get from mains to LEDs.
.  If a transformer is involved, it's a definite no.
.  Even if the lightbulb will accept DC, it will probably be closer to mains voltage.
.  With a voltmeter and a little disassembly of the bulb, you can determine the DC voltage supplied to the LED array and feed it directly to the array - you might get lucky and it's your target 12/24VDC.
RussellG122 years ago

I had nothing to lose so I tried it. I used a Cree 120-250 volt AC nondimmable light build and it started to light up then went dark. It has a capacitor in there so I installed a resistor to limit current and now it works on 10 to 30 volt DC. I am converting all my AC only LED bulbs to DC and going to epoxy them back together using Anderson Power Poles for my snow thrower lawn mower garage to light up the place. NO AC there. Just a 48 volt solar panel on roof and 48 volt bank of batteries. Lots of 48 to 12 volt DC-DC converters. Some brands do have a converter in them but never saw one yet. I am going to take part a " dimmable" LED bulb next week and see if it has a capacitor in it. But it is for narrow band of AC voltage vs the wide range of 100 to 285 volt AC input. The non-dimmable bulbs stay relatively bright from turn on to full brightness. So when they turn on they are on. Three screws on base so it is easy to get to LED inside the Par 30 LED bulb. KB1UKU

orksecurity6 years ago
It Depends. If its internal power supply involves a transformer, DC won't power it at all. Other power supply designs may or may not work.

In other words: I wouldn't assume. Trying it _BRIEFLY_ is unlikely to do any harm. Personally, I wouldn't trust it unattended unless I had opened it up and really analyzed its circuitry.
Yes, maybe, or the thing will only light half the LEDs