I must be in the minority that likes blue LED. But it can't be so bright I get question from FAA and FBI investigating possible illegal laser pointing at planes. If I am going to mod older consoles, it will be using red and green LED. Older, low brightness LED aren't easily found these day but with modern high efficiency (and eye-blinding bright) LED it can be tamed by increasing resistor value a lot. For example, a typical hi-e red LED may do best with 220 ohms resistor on 5v rail but a 1k resistor will bring that down to almost the same as old 1980's era LED. (not to mention usually they last a long time on lower voltage/current)