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Old 07-08-2008, 12:00 PM   #1 (permalink)
 
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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.
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Old 07-08-2008, 07:10 PM   #2 (permalink)
 
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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.
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Old 07-08-2008, 07:15 PM   #3 (permalink)
 
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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.
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Old 07-08-2008, 09:00 PM   #4 (permalink)
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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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Old 07-09-2008, 08:21 AM   #5 (permalink)
 
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Re: Anyone good with formulas?

Thanks for the help and don't worry we do change our lamps but don't you ever wonder these kind of things. We do.
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Old 07-09-2008, 12:29 PM   #6 (permalink)
 
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Re: Anyone good with formulas?

and that's a good thing.
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