Just wanted to comment on the kelvin issue. Coming from the reefkeeping hobby, color spectrum/kelvin and PAR is a heavily debated issue when dealing with coral growth and the photosynthetic needs of their zooxanthalae (symbiotic algae that gives the coral its color).
Anyway, for the greatest PAR and best coral growth, 6700k halides are used because this really close to the spectrum of the noonday sun over the tropics(which is a pretty commonly accepted in reefkeeping.) I notice that you suggest 5500k for this...a kelvin rating that any serious coral keeper would avoid like the plague. You also describe the 6700k spectrum as "blue". Ironically, the reason so many reef hobbyists don't like this bulb (regardless of it's ability to stimulate coral growth) is its yellow cast on the tank. Most people prefer a 10,000k bulb for a nice clean white...and don't see much blue until they hit a 20,000k bulb. However, it should be noted that the lighting industry uses kelvin ratings somewhat loosely and more for the benefit of the hobbyist so that we can have an idea of the spectrum it will create (i.e. 50,000k bulbs, etc.)