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Thread: How expensive is indoor florescent lighting?

  1. #9
    swords's Avatar
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    Well you must consider that the few extra watts is giving you double the lumens (light output), so one of these bulbs equals two of yours and T5 HO bulbs don't need replacing for about 4 years as opposed to every 6 months or so with NO bulbs if you want maximum lumen output.

    I was resistant to T5 HO too I liked my old T12s but once I tried them...

  2. #10
    War. War never changes. Est's Avatar
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    Quote Originally Posted by Wolfn View Post
    Howdy. I'm about to get into indoor growing and I would like to know how expensive it would be in regards to monthly usage.

    I ordered this light fixture with a 125watt bulb:
    http://homeharvest.com/hydrofarmcompactfluorescents.htm


    My question is: with a 18-hour photoperiod a day, how expensive would this add to the monthly electric bill?
    Every time you consider this question, you need to know a little bit about your current electricity usage to get an accurate answer. Electricity prices are not linear, rather, they are tiered. So, for instance (using the cost of electricity in my area):

    At the lowest tier of $.12 per kilowatt-hour, using 125 watts for 18 hours per day for a 30 day billing period would look like this:

    ($.12/kWh)*(1kW/1000W)*(125W)*(18h)*(30days)(1month/30day) = $8.10 per month

    At the highest tier at $.40 per killowatt-hour with the same usage:

    ($.40/kWh)*(1kW/1000W)*(125W)*(18h)*(30d)(1mo/30d) = $27.00 per month

    But, do note, that even if you DO break in to the highest tier, it wouldn't be until some point later on in the month. So that $27 figure isn't really attainable and was, rather, meant to illustrate the type of effect that tiers can have. So be wary about giving your parents a low estimate.
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  3. #11
    Lover of Mountains nightsky's Avatar
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    Wolfn, I came up with $4.75 per month at my electricity rate. You'll need to know your cost per kwh to figure it out. Shouldn't be bad.

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    Hotrod30's Avatar
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    For me running a 125 watt bulb for 18 hours would be $9.07.

    125 X 18 = 2250 W

    2.25 KW X 31 days = 69.75 KW

    69.75 KW X $0.13 per K = $9.07 per month


    My setup runs about $1.25 a day when I have the lights on for 16 hours.

    Right now the lights are on about 9 hours a day. I believe in the sunrise - sunset method.
    Last edited by Hotrod30; 02-01-2011 at 08:15 AM.

  5. #13
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    Quote Originally Posted by Hotrod30 View Post
    For me running a 125 watt bulb for 18 hours would be $9.07.

    125 X 18 = 2250 W

    2.25 KW X 31 days = 69.75 KW

    69.75 KW X $0.13 per K = $9.07 per month


    My setup runs about $1.25 a day when I have the lights on for 16 hours.

    Right now the lights are on about 9 hours a day. I believe in the sunrise - sunset method.
    Nice calculation dear. Here i got some doubt about the charge of the per unit will differe because of the location and the electricity company 's rate per unit. so need to calculated myself an it is around $ 25 per month only.
    grow tent and be healthy

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