Hi friend. How can I connect 20 1w RGB LEDs with a common anode and turn on all three colors at the same time. It is for an aquarium lamp. And also if possible I would like to know how to control the intensity of the light.
Hey man, this video's awsome!!! I just have a quick question, how do you do the calculations for finding right voltage going through the led? Aren't we supposed to also keep track of the mA?
Yes. I used the specs for the leds. Each led gas three working voltage and current requirements. I then used ohms law to find the resistor values. The resistors drop voltage and also limit current.
+brundog807 I also just rewatched the video. I see what you mean how I am only speaking about voltage. Basically the resistors are using the current that I put in the formula to get the required voltage at that same current that I need.. Each color has its own working current and voltage.
The current doesn't make a difference (It DOES, but you don't have to worry about it if you have the correct voltage), the "350ma" current draw is the maximum the particular LED will draw at maximum voltage so you shouldn't have to worry about current. You don't want to exceed the maximum voltage on their spec sheet. The LED has it's own resistance, so you have to get the voltage from whatever source you are using (12v for example) to the required voltage using a resistor.
A 3 Watt RGB led means 1 Watt per each led R G B. Your resistor calculation for RED was 12 volts, forward voltage of 2.2 = 33 Ohm resistor. which means 300 ma current and 3 Watts Power. If each RGB is only 1 Watt shouldn't you have used a 100 Ohm resistor to get 1 Watt of Power. This is only 100 ma current. These LED's are rated at ~300 ma to ~350 ma. So it's current not voltage that drives the brightness of the LED. So i see why 33 Ohm resistor was used.... still seams like you are driving 3 volts into a 1 volt led.....still a bit fuzzy in my non EE mind. This is an LED not an incandescent light bulb. set me straight, thanks all
Isn't this technically a 1 Watt RGB LED as its current is up to 350 ma. per R G B channel. A 3 Watt would be up to 700 ma per R G B channel. Just trying to understand. Thanks
Hi friend. How can I connect 20 1w RGB LEDs with a common anode and turn on all three colors at the same time. It is for an aquarium lamp. And also if possible I would like to know how to control the intensity of the light.
how much ohm resistor did you use...?
And how many voltage..?
4.50 what is the name of this led box
Hemalatha Gandhi it is called a 3knob RGB dimmer.
You are supposed to use a constant current voltage supply for those types of leds
Hey man, this video's awsome!!! I just have a quick question, how do you do the calculations for finding right voltage going through the led? Aren't we supposed to also keep track of the mA?
Yes. I used the specs for the leds. Each led gas three working voltage and current requirements. I then used ohms law to find the resistor values. The resistors drop voltage and also limit current.
+brundog807 I also just rewatched the video. I see what you mean how I am only speaking about voltage. Basically the resistors are using the current that I put in the formula to get the required voltage at that same current that I need.. Each color has its own working current and voltage.
ohhhhhh that makes a lot of sense! thank you!
The current doesn't make a difference (It DOES, but you don't have to worry about it if you have the correct voltage), the "350ma" current draw is the maximum the particular LED will draw at maximum voltage so you shouldn't have to worry about current. You don't want to exceed the maximum voltage on their spec sheet.
The LED has it's own resistance, so you have to get the voltage from whatever source you are using (12v for example) to the required voltage using a resistor.
+n2ocharged thats is very useful!!! thank you!!!
What is the name of led color changing box Type
3:40 what is name mini chip tyip of thing sey pls pls
It is a full line pattern perf board cut into a single strip.
Where did you get the LED's and controller from
Ebay
Hi sir input voltage 12v 3w rgp light. 8 light resistor value sir
Sir yes sir!
A 3 Watt RGB led means 1 Watt per each led R G B. Your resistor calculation for RED was 12 volts, forward voltage of 2.2 = 33 Ohm resistor. which means 300 ma current and 3 Watts Power. If each RGB is only 1 Watt shouldn't you have used a 100 Ohm resistor to get 1 Watt of Power. This is only 100 ma current. These LED's are rated at ~300 ma to ~350 ma. So it's current not voltage that drives the brightness of the LED. So i see why 33 Ohm resistor was used.... still seams like you are driving 3 volts into a 1 volt led.....still a bit fuzzy in my non EE mind. This is an LED not an incandescent light bulb. set me straight, thanks all
Isn't this technically a 1 Watt RGB LED as its current is up to 350 ma. per R G B channel. A 3 Watt would be up to 700 ma per R G B channel. Just trying to understand. Thanks
@@jameswiser 3v*300ma=3v*0.3A= 1W times 3 colours = 3 Watts
its ok its 1w eatch color
4:50