What is the difference in power consumption between these two RGB LED circuits, one common cathode, the other common andode?
\$\begingroup\$
\$\endgroup\$
5
-
3\$\begingroup\$ How could there be any difference? Please explain. \$\endgroup\$– Roger RowlandJun 17, 2016 at 6:46
-
\$\begingroup\$ Where did the statement come from? There may be some context behind it. Assuming the same supply voltage, same base LED devices and the same resistors, the power will be the same. \$\endgroup\$– Peter SmithJun 17, 2016 at 6:48
-
\$\begingroup\$ Haven't you already asked the question? The schematics are unnecessary. Better would be to tell us where you have heard that. Because as it is, it is wrong, but maybe there was some particular context in which it was right, but we can't know. \$\endgroup\$– dimJun 17, 2016 at 7:24
-
\$\begingroup\$ With your schematics the answer is, obviously, not. But if the circuit is arranged like in this question maybe the power dissipated on resistor is different because there isn't the resistor! \$\endgroup\$– AntonioJun 21, 2016 at 9:42
-
\$\begingroup\$ The first result when searching: vision-pi.net/common-cathode-vs-common-anode-led, seems to suggest you can use less power with the common cathode circuit, E.g. by varying the supply voltage for individual RGB channels. \$\endgroup\$– AzmisovJul 29, 2022 at 19:20
Add a comment
|
1 Answer
\$\begingroup\$
\$\endgroup\$
2
Is it right? No it is not
It is utter nonsense stated by someone who obviously knows nothing about LEDs and/or electronics.
From the LED's point of view, they don't even "know" how they're connected.
Maybe the person who made the statement compared a 20 years old common cathode to a brand new common anode. Sure in 20 years LED efficiency has improved but that is unrelated to the way the LEDs are connected.
-
\$\begingroup\$ Thank's for reply. Then, in captured image, how to calculate power consumption? \$\endgroup\$– ryanJun 17, 2016 at 7:34
-
\$\begingroup\$ Power is voltage x current so measure both and calculate. \$\endgroup\$ Jun 17, 2016 at 7:42