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- Newsgroups: rec.gardens
- Path: sparky!uunet!cs.utexas.edu!torn!nott!bnrgate!bcars267!rthacker
- From: rthacker@bnr.ca (Rob Thacker local login)
- Subject: Re: Q: Cost of starting seeds indoors
- Message-ID: <1993Jan25.133951.8555@bnr.ca>
- Keywords: seeds, light table
- Sender: Rob Thacker
- Nntp-Posting-Host: bcars64d
- Organization: Bell-Northern Research, Ontario, Canada
- References: <1jut5tINNirr@srvr1.engin.umich.edu> <C1E197.559@acheron.uucp>
- Date: Mon, 25 Jan 1993 13:39:51 GMT
- Lines: 22
-
- In article <C1E197.559@acheron.uucp> clarke@acheron.UUCP writes:
- >In article <1jut5tINNirr@srvr1.engin.umich.edu>, wondering writes:
- >|>I realize that this depends on the wattage of my lights and how
- >|> long per day the lights are on, but I'm not even sure what would
- >|> be a good level for these.
- >
- >Use at least two shop lites ( 4 bulbs total ). This comes out to
- >160 watts * 10 hours = 1.6kwh/day * 30 days = 48 kwh/month. In my
- >unfortunate situation, this is 12 cents/kwh or $5.76 per month.
- >
-
- Actually, it's both worse, and better! The worse is that the
- ballast for the lights takes energy too, usually about 16 watts
- for two 40W tubes, so your setup actually uses 192 watts.
-
- The better part is that the 192 watts you use is also 192 watts of
- electrical heat (except for any light which escapes through
- the windows). If you heat with electricity, then heating with
- light (in a windowless room) is no more costly (the light is
- absorbed by dark surfaces, heating them). Of course,
- natural gas makes for cheaper heating, but oil is probably
- about the same.
-