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			#6  
			
			
			
			
			
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|   i have a 175W MH and 250W MH for my orchids and together they only cost me a few bucks a month, its easy to calculate the cost per month, (watts / by 1000) X Hours/month XHydro Rate in KWH, for me its (425 \ 1000) X (10X30) X (.065) = 8.28 per month |