I am a complete beginner at designing circuits and my English sounds like a 5-year-old talking. So, please beer with me. I was thinking of building an aquarium light. As plants need a full spectrum of light to grow properly, this is the selection of colours I came up with by watching many YouTube …

[image] ishraq6251: Won't there be a lower resistance path through the red and yellow LEDs for the current to flow? Which in turn will make them brighter than the rest or possibly even damage them. Absolutely correct. That is why the series current limiting resistors will have different value…

[image] ishraq6251: Is it ok to connect LEDs in parallel like in the schematic? No as a rule, even if they are the same color, as there are manufacturing variations in forward voltage drop. You can connect LEDs in series, as the same current will flow through each one, regardless of color or…

Is it possible to use something like this: [575014064381461159 (1)] These are readily available in my country. There is an output voltage range of DC180-240V written on the device does that mean I can use a string of LEDs with a forward voltage within that range? Are these devices safe? Are they …

[image] ishraq6251: Is it possible to use something like this: Yes. The LEDs go in series. That's unusual. Usually a constant current source would be 0-240V, or something like that so you can drive one LED or a small number of LEDs and the voltage will go-down. Or usually you can even s…

[image] DVDdoug: Usually no. When the MOSFET turns off during the PWM cycle it will try to continue to push current through an infinite resistance and the voltage will jump to the maximum. If I use a MOSFET with a higher Vds than the maximum voltage the driver can create will this PWM dimming…

Can I power LEDs of different forward voltages connected in parallel with a single constant current source?

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Paul_KD7HB February 5, 2024, 9:56pm 2

Absolutely correct. That is why the series current limiting resistors will have different values for the different color of LED.

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Can I power LEDs of different forward voltages connected in parallel with a single constant current source?

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