Don't go shopping just yet. As Donald pointed out I am making this a bit complicated. I got carried away with trying to prevent the LEDs sharing one resistor and that I was using tectrode less LEDs that are way more sensitive and use less power. So let's get back to basics.
Build a test circuit like https://groups.io/g/electronics101/photo/286073/3614853?p=Created%2C%2C%2C20%2C2%2C0%2C0 but leave the resistors loose so that you can change them, connect them with your clip leads. then power it up. This does not need to be on a board, If you are happy with the red brightness then we will use that 510 ohm resistor this is the top one in that diagram. Then look at the green, if it is too bright then add more resistance to the bottom one in that diagram (put another 510 or whatever from your spares in series) play around with what is in your spares box, keep adding/adjusting until you have it the way you want it. Then add all those resistance values together to see what value you need and we will go from there.
Tony
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