Not sure I understand what you’re saying, but it doesn’t matter what color leds are on to initiate flowering. They could be all blue, all red, all white, or any combination of those or any different color. Autos are going to flower when they flower based on age and photo plants are going to flower based on reduction of amount of time they get light or when mature if already on a short light schedule. Different wavelengths of light can make plants behave a little differently. Red light for example can cause internodal elongation. But won’t make your plants flower unless other situations are true.
I have been at this for a while. Have flowered with mh when some people say you shouldn’t. I have vegged plants with hps when people say you shouldn’t. I have molested, taken apart, put back together, grown with, thrown on the floor and even hit with hammer countless numbers of led fixtures. I have even custom built several of them that you could probably see in action somewhere here on the forum, even assisted others in building their own. You can do a lot with multi channel grow lights, but not initiate flowering by adjusting the emitted light spectrum. It is likely just a coincidence that you were adjusting light at time they were transitioning to flower.