To simplify: Red is the lowest energy visible light and therefore the easiest to produce. Blue is the highest energy, and therefore the hardest. It is telling

To simplify: Red is the lowest energy visible light and therefore the easiest to produce. Blue is the highest energy, and therefore the hardest. It is telling that the 2014 Nobel Prize in was awarded to the inventors of the blue LED, and not one of another color. Once you have blue LEDs, using phosphors, you can convert that high energy blue light into a spectrum of lower energy wavelengths, i.e. white light. You can't have white light with red and green LEDs, or at least not that easily. As for you finding LEDs too blue, that's most likely an issue with the phosphor mix they are using, maybe there are some LEDs that go below the typical 2700K "warm white" standard that will be more to your liking. I don't think lighting with pure red or pure green is a good solution since without a blue component at all, blue objects will appear black, and you will have a result a bit like with these yellowish high-pressure sodium lamps that are common in street lights, which in technical terms is a low CRI. You can try it though: get RGB lights and set them to red, green or yellow.