Ok so is pink, purple and violet included in that red light bleaching isssue?
While I hater to do it here the only way to answer this is to explain the basic color spectrum and the human eye. The eye has three sensors for normal daylight color. They are red, green and blue. When the eye sees light it sees them as as the activation of these sensors in different levels which feeds the grain signals and thmind determines what color we are seeing.
If onlky the red sensor is activated we see the color red, if the red and green sensior is equaly avtivated we see yellow. if only the green is activated we see green, if green and blue is activated we see aqua, if only the blue is activated we see blue. Finally if we the blue and red is activated we see purple. Now keep in mind the sensors in the eye are tuned for max sensitivity of red around 640nm light, green around 530 nm light, and blue around 480 nm light. But they are wide spectrumed so if we see light at 580nm it will activate our red and green sensor causing us o see it as yellow or yellow orange. If all the sensoirs are activated equaly it will appear as white light.
So from our basic color sensors to see peopl we are actualy seeing light that is activating our red sensors and blue sensors. If we also increase the light activating the green sensor the color make look more pink.
However the eye color sensnors are very poor in low lighting situations. Therefore we have want is called noght vission which is activated mainly by light in shorter wave lenghts than the blue sensors normally sense. In a true darker enviroment our eyes sense a more black and white image which the interputation of the brain. However if the right level of these longer wave lenghtlight is detected do to chemicals in the eye called visual purple they become inturputed by the brain as light which is smular to whatwe recognize as violet or purple.
So in reality when we are talking about purple r violet it could be a combination of red wavelenghts and blue wave lenghts or light in the very short wavelenghts that are shorter than blue light.
As an example if you got LEDs that have a very narrow band width and compared there colors. a 470nm LED would look fairly true blue to 85% of people. The 455 nm royal blue LED would look like it was a blue with a slight purple tint to 86% of people. a 430 nm LED would look more purple with a strong blue tint. and a 380 nm LED would look purple. Yet another light source with light near equal levels of light at 470nm and 640 nm may appear to a very simular purple color to light at just 380 nm.
So the end answer is no all purple light is not detrimental to corals It depends on how the purple is created and how intense the red is if there is a strong red element. Then you can complicate the matter eve more so with corals as some deep water corals are cvvery sensative to red light and others shallow water corals even require some red light.
Now I'll also through another ringer in the situation as extremly short wave leght light is also detrimental to corals as it is to humans in creating sun burn, skin cancer, and cataracs of the eye. However most comercial light sources do not produce enough light at these levels to be of concerned especialy do the fact the even clear glass will filter out a makority of that light.
