When figuring electrical consumption, you must figure in many factors. 4 110-watt bulbs will drain 440 watts, period. How these watts are achived is a completely different story. Some ballasts, such as Icecaps, are more efficient due to the type of ballast. There are generally two types of florescent ballasts. Electronic, and magnetic. Electronic ballasts are more efficient and run at a cooler temperature than magnetic. You must also consider the power supply driving the ballast, whether it is standard 110-volt, or 220-volt industrial. Most importantly is how many AMPERES your system setup is consuming. Consider this: a 100,000volt tazer gun is enough to immobilize a man, but not do serious injury. A 110-volt standard electrical outlet is enough to stop a man's heart and burn any flesh at entry/exit points. The difference between the two is amperage. 100,000 volts at 1 ampere is not very powerful, but 110volts at 30 amperes is enough to kill. This is also true of your lighting system. 440watts at 7 amperes(Icecap 660 running at a max) will consume less energy than 440watts at 10 amperes(Radionic Industries standard florescent ballast). Hope this clears up a few questions.