From IceCap: 
If all you are measuring is wattage consumed then a pair of 250-watt incandescent lamps should be better than an IceCap running 285 to 320 watts (depending on the load it senses) through 4 X 4ft fluorescent lamps.   
 
The other problem with this rule of thumb discussion is it discounts the fact that an IceCap ballasts runs at +/- 27KHz frequency and have a soft start to prolong lamp life.  I don't know of any other ballast that can be placed over 100 feet from the lamps and does not need a grounding plane behind the lamps to light them.  We use a different technology to light lamps. 
 
Andy 
		
	
		
		
		
		
		
	
		
		
	
	
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