I guessed that the Vf of led could be 3V~3.6V, and there are 3 leds in series in the picture, so it should be as 9V~10.8V, and that was matched the voltage from the labeled, they also labeled it as "三串三并" it means that it is a 3x3 led, you also can see the post #4.Wow Scott! How did you find out there are 3 sets of 3 parallel LEDs in the package??
According to my experienced that they like to exaggerate the values of spec, like as I have had a electronics load that the real wattages about 150 watts, but they claimed that it has had 400 watts.Hello,
Are those typical chinese specs?
Yes, you are right.11 Volts @ 600 mA will lead to 6.6 Watts and not 10 Watts.
At this one they give 9-12 Volts @ 1050 mA:
http://www.ebay.com/itm/10W-Watt-Co...860715&hash=item25812ffd93:g:-SwAAOxy1NxSEsC5
Bertus
Its typical Chinese mistakes/inaccuracies/misleading information..Are those typical chinese specs?
But how do I identify? It is heats up on 8 volt as well as 12 volt or 14 volt.Start with a low voltage and while monitoring voltage and current slowly increase the voltage until the LED offers the intensity you expect and note the voltage and current. Starting with 12 volts and a LED of that type with no apparent current limiting resistor is not at all a good idea. You want an adjustable power supply or start with 1.5 volt batteries addig a battery in series each step, such as 3.0, 4.5, 6.0 ....
Ron
I attached it with 6 volt 500 mA and among there 6 lights only one lights up. And also added 220 ohms to 12 volt power supply, it is heats up.It looks like a white LED and if you were lucky it was a reverse polarity diode that heated up.
The voltage is probably somewhere between 3 and 4.5 volts depending upon the quality. Except in very carefully controlled circumstances you should, as Reloadron just told you in post #2, always limit the current to an LED with a resistor or current source rather than driving it with a voltage. It looks like a nice big one that could take a lot of current, but if you limit the current to a few milliamps when you start out you should be able to see a glow if the LED is still any good. A 12V power supply and 330 to 470 ohms would be a good place to start.
IF there is a reverse polarity protection diode it will measure less than a volt when the LED is biased in reverse.
One has to wonder why it was in the garbage.
I attached a heat sink to this led, you can see above. Is the heat sink so small to power dissipation?Please check this:
Vcc : 9-11V
I = 600mA
W = 10W
Led : 9 piece
3 in series and then 3 in parallel, so there are 9 Leds inside.
When you use this kind of led then you need to use a heat sink for the heat dissipation.
View attachment 132712
As has already been mentioned a couple of times, start out slow and work your way up.But how do I identify? It is heats up on 8 volt as well as 12 volt or 14 volt.
Sounds like you are discovering why it was in the trash.I attached it with 6 volt 500 mA and among there 6 lights only one lights up.
The proper technique would be to use a thin layer of thermal paste to fill in all of the voids between the heatsink and the LED.four corners of very small contact via the solder will not provide sufficient thermal bonding between the LED and the heatsink
Yes. And likely to clamp the LED to the heat sink. Unless you use a thermal epoxy to bond it to the heat sink.The proper technique would be to use a thin layer of thermal paste to fill in all of the voids between the heatsink and the LED.
That type of LED often has multiple dies in series, so no way a DMM diode check will tell you anything.I found this kind of LED from garbage.
I don't know its voltage or wattage rating.
And there is no printing over LED.
I connected it with smps (12 volt 0.5 amp) and its heats up.
Is there any way to measure this LED.
View attachment 132697
Dont panic. I just wanna make a emergency light by it.Sounds like you are discovering why it was in the trash.
by Aaron Carman
by Jake Hertz
by Aaron Carman