funny... i have been squeezing blue lights into my tanks for years. lately, i am using actinics because they cause the plants to produce more red pigments. LEDs will not cause this, unless they produce UV. i do have some blue grow panel LEDs that i have tested and noticed some incredible growth rates, but the plants didnt show the deep reds that i like so i switched back to actinics.
i usually meet with ridicule when i mention this though, so i normally just keep it to myself...