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Common LEDs requier 20mA and voltage drop is 2V. If you use 7,2V batteries and the voltage drop is 2V you have to calculate something like this:
7,2V-2V = 5,2V devided in 0,02 (20mA)results in 260 and that is the value of the resistor you need to use. You can use a resistor close to the value of 260 Ohm if you don't get the exact value.
Good for you. Many have blowed there LEDs here. Why blow another one? It was just a hint for not blow LEDs. I will get mine within some days and I will check them out carefully. By the way, you say that you have connected the LED to your transmitter? Are the voltage output from where you have conneted the LEDs 7,4V? Check that out.
Yikes! You're right. Mine are still on the way and I probably wouldn't have noticed that. Thank you very much, you've almost certainly saved me some money, thank you very much for that and sorry that you found out the hard way.
How is this multi-colored or programmable? A more detailed product discription is greatly needed here. maybe a Youtube video. Hobbyking daily? Please someone discribe this for us.
it does not say it's programmable, it says it's pre programmed, i would assume it just runs though each "pre programmed" sequence and then starts over.
I bought several of these LEDs. One blown as soon as I connected it to the battery 7.4 V. Tried to 3.7 In - heats up very quickly, managed to turn off and he had no time to burn-out. How to correctly conn
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PeterBe
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As you can see from picture comes with negative and signal wire reversed , worked really well at 6v , at 8.4v , as recommended , death was instantaneous
Very good lights. Two different flash patterns. One is flasing all 3 colors: RED, GREEN, BLUE. The other pattern is slowly fading onto each color: RED, GREEN, BLUE. It works with my 7.2V 20C LIPO. Just connect to a servo plug. No resistors needed. Works straight out of the package.
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5/4/2013 ArNe
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Just tested and works at 8.5V (but the limit is there, at 8.6V or more it's broken)
Here are some test results for those who interested.
It isn't easy to measure the current because of the changing color all the time but these are the results.
3.5V 5mA-20mA
5V 50mA-65mA
6V 70mA-110mA
7V 80mA-120mA
8V 85mA-130mA
There is actually no need to go to 8V. 6V will give about the same amount of light. The only thing you get it more heat.
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