I have just replaced a Coralife 10,000K bulb with the 14,500K Gieseman bulb. Initial observations are very positve. The bulb gives off a very nice icy blue color without the godawful blue I experienced with an Arc 14,000K Mogul bulb. It is also very intense compared to the aforementioned bulb. In addition the green colors in the tank fluoresce nicely.
