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07-08-2008, 12:00 PM | #1 (permalink) |
Join Date: Jul 27 2005 Location: Warner Robins GA, 31088 Age: 40
Posts: 144
Rep Power: 0 | Anyone good with formulas? I know it might not be that hard, maybe I am thinkning to hard, but does anyone have a formula to determine the cost of lamps per minute used. I want to know how much lamps cost me per minute or session used. Any help would be greatly appreciated! Thanks. |
07-08-2008, 07:10 PM | #2 (permalink) |
Join Date: Aug 12 2002 Location: Michigan Age: 60
Posts: 338
Rep Power: 22 | Re: Anyone good with formulas? Ok, let's see, if you want price per lamp in cents. cpm = (ppl*100)/(hrs*60), where cpm = lamp replacement cost per minute ppl = price per lamp hrs = hours used If you want to know the total bed lamp cost per minute, multiply the lamp cpm by the number of lamps in a bed. |
07-08-2008, 07:15 PM | #3 (permalink) |
Join Date: Aug 12 2002 Location: Michigan Age: 60
Posts: 338
Rep Power: 22 | Re: Anyone good with formulas? BTW, if you want to calculate lamp cost per session, multiply the bed cost per minute by number of minutes of a session. For example, a $10.00 lamp that lasts 700 hours in a 32 lamp bed will have a single lamp cost per minute of about 0.024 cents per minute per lamp, or .76 cents per minute for the whole bed. A 20 minute session will cost about 15 cents in lamp costs. |
07-08-2008, 09:00 PM | #4 (permalink) |
Team TanTalk Join Date: Aug 27 2002 Location: East Coast Age: 56
Posts: 2,888
Rep Power: 22 | Re: Anyone good with formulas? Try this math.... 32 x $10 = $320 per change $320 / 700hrs = $0.46 per hour $0.46 / 60min = $0.008 per min or a 20min session costs $0.16 The bottom line is change your lamps.....they really do not cost that much! |
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