We keep a number of different Africans, and none have shown sensitivity to light, however, if it is really bright as in "really in your face" kinda bright, then they may not like it. None of our lights on the Af tanks are overkill as such with brightness They possibly may settle into your tank and adjust to the lighting tho, since they have only been in the tank since earlier today, if they continue to follow the same behaviour pattern tho, I would definately look at changing it.
Just looking at your pic tho in other thread, it looks fine to me, maybe they are just settling in, and feel a little more secure with just the room lighting, but when the tank light goes on it is a different story and they may feel more vulnerable...