Im running 2 Icecap 660's over a 100 gallon(VHO). I am only running 6 - 110 watts bulbs for a total of 660 watts of light. I run them 12 hours a day. I am wondering how much this will effect the electricity bill? Any ideas? Reason I ask is I am thinking that my bill has jumped from say $75 per month (in the off season meaning not using the A/C) to around $120..does this seem reasonable for VHO lights?