That is exactly what you need to do. Increase the resistance in the one that is too bright.
Your design current (I think you are shooting for 20mA) is the current at which many of these devices is characterised. It is not necessarily any kind of "optimum", just a way for manufacturers to specify the characteristics so that it is easy to compare devices' voltage drop and brightness.
I'd be inclined to use less current all around, but I don't know your operating environment - you may need more or less light from the entire set. Also note that device-to-device differences can be visible when you get a lot of LEDs in an array.
HTH,
Donald.
On 2023-05-13 23:04, Ian Bell via groups.io wrote:
UPDATE:
Hi Tony, sorry to be a PIA, How can I set both LEDs to approximately the same intensity?
2 photos uploaded of test board and micro switch showing brightness of LEDs using 2 x 510Ω resistors. Should 1 of them be upgraded/downgraded to higher/lower value?
Ian
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