Their are ways of maintaining corals that are more light loving than others with less than optimal lighting fixtures. Positioning the coral higher up in your tank will help, likewise if your corals are receiving too much light you can raise you lights or lower the corals in your tank.
Remember that light represents just one aspect of maintaining healthy corals. Corals can also be maintained under less than ideal circumstances though the vibrant colors will not be evident as if the lighting were ideal. Water parameters, water flow, dissolved organics, tanins, terpenes, turbidity, salt creep on light fixtures and tops and temperature all play a part in the success of your corals health, NOT JUST LIGHT!