Does anyone know - roughly - how much current these LED rings draw? I assume it's close to 350mA but anything more specific would be much appreciated
443817
no I measured the amps. at between 130 - 160 ma. thats at 12v-13.6vdc hop it helps
1238561
You have to use a dropping resistor to limit the current. Start with a 470 ohm resistor. When you hook up an LED without a resistor it is like a dead short and you burn up the LED. LEDs usually operate at 2.5 to 3 volts. Do a search online for a more in depth explanation.
940704
I recommend a 9v battery with a 1k resistor. You could fine-tune the voltage and resistance, but those are easy and quick numbers that I've tested on a string of 10 LEDs.
642873
The LED's will probably out live me! They get only slightly warm after running them for a while. They can run all night long no problem. Power efficient too!
2190372
The problem would be to convert the power supply to match the voltage requirements of the LED bulbs. The battery pack puts out a 7.1 to 8 volt max. It would be very easy to fry these if you don't have the proper power source.
1082317
These are SMD LEDs, which are designed for 12.0V-DC. The will, however operate on as little as 9V, up to a maximum of 18V before damaging them. They are DC ONLY! Running on AC current will damage them permanently. Also, 16.4' utilizes roughly 24W of power, and requires 2A output minimum on the power supply. If you are running these from the RV battery bank or the alternator, you will have more than ample power to supply several of these strips nightly. I am running six strips of these lights, one of them 24x7 from a bank of two 100Ah deep-cycle batteries, and the draw per day is only 12% of my total off-charge capacity daily. One strip can be ran for 4-days or more, without recharge! In an average RV setting, 4-6 hours per night, two batteries will supply the several strips for a week without need for recharge.
1699242
The fact they are LED they will not draw as much electricity as a luminescent. With fresh batteries I have had the lights on for 4 hours. The next time I used them for two hours with no dimness of the lights.
1340742
Most led's like this will run at a varying voltage. Usually this style will work with 4~18 volts at least. They may run slightly dimmer but it will most likely be not noticeable. If you would like i can go hook mine up to a 6v DC power source and see how they act. ( i bought them from here, decent lights, not the best of quality, wire isn't copper and a very very small gauge. I soldiered my connections because i was worried about the wire just breaking off without the insulation on it.
340752
If you are lighting LED's in direct sun only with no batteries and the LED's you are using will run on 3V, then typically LED's draw 20mA, so it would light 3 of them if the above assumptions are true.
1228134
The LED chips on mine are clear potted into the white plastic base. The pwr leads seem to be molded into the bases also. That said, ultimately the mfg should specify if they are indeed water rated- resistant or proof? Sorry I cant offer more info, it didn't seem like these had a data sheet when I received mine. What I can tell you is on 13VDC SLA battery these are rather bright, two modules (6 LED chips) will moderately light up a smallish dark room. They should do reasonable well for sign backlighting given enough modules are used. Their CRI I would guess to be in the high 70's -low 80's as they seem to look to be 7000plusK.
1117108
FYI, probably not as intense per LED than the epandahouse (Ebay) 12-chip white LED panel they have. 3.1 watts, ~250 lumens with 12 5050 LEDs.
929990
The voltage needs to be around 12V or less. 3.4 volts is not enough to turn on 3 LEDs in series. The question is how much current is required. I think it is about 1.2Amps /Meter, and if this is 10M it would need to be more than 12Amp
252125
They are LEDs so you shouldn't have a problem. I didn't notice them getting all that hot. Granted, I haven't left them on for hours at a time and then tested.
2118955
We used 80% of 3W/cell EPISTAR LED bulbs(not 100% to protect the bulb for long life-span), that's 2.4W each,100pcs should has 240w output power,if you use in 12V the current should be between 20A to 22A,and the lumence should be about 24000LM to 26400LM.
3545
The item description says they draw 90 milliamperes (90 ma.) at 12 volts. That's 0.09 Amperes. If you multiply that times 12 volts you get a little over 1 watt. The incandescent bulbs that they replace draw 4 watts. So, you could power 4 times as many of the LED replacements with the same power pack. However, I think the big advantage of these replacements is that they don't burn out.
262766
These are not just regular LEDs. They are LEDs controlled by a small controller chip. The forward current varies wildly as they flash as can be noted by watching the current with a scope. No need for a series resistor at all. Just hook them up to 3 VDC or so and away you go. I noted that they begin to work well at about 2.5V and current draw begins to get fairly large at about 4V. Within that voltage range no need for resistors.
587576
Assuming you mean you have an AC adapter that outputs 12v DC, you'll probably burn out the led without putting a resistor in the mix. LEDs typically only need a few volts to light