I have had no problems with coraline growing, and by most standards, I have low lighting. Prior to adding 1 40W bulb at Christmas, I ran 1 Actinic and 1 Triton bulb, both 40W for over 8 years. I have plenty of coraline in my 80 gal tank.
I have not tried more lighting, but like Marek said, it will grow in what many consider poorly lit tanks.