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Re: Re: Lights & Tom

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Bill writes:
> *They [fluorescents] are 90% efficient where an incandescent is 25%
> about.  You are at about 65%.  Replace them

*Aside from the below, replace in a year may still be wise and is SOP.
Life can be from 2500-500 hours, under 'normal use.'  Varies a lot, and on and
off is the hardest on them.  Yet hours count too...

*So it's like a disk drive.  Except on a portable computer, where battery is
the more important factor, don't put this 10-30 wats device to sleep in power
settings.  Drives are cheap, finally, but loss of data and time to recover is
the important factor.  Email me offList if you need help. 

>According to http://www.state.sc.us/energy/efflight.htm, incandescents
are no more than 10% efficient, while fluorescents are "up to 5 times
more efficient", which presumably means 50% or less

*Yup...!

>Another web page (http://www.holophane.com/School/HL-862.htm)
explains that LPS lights deliver 100-180 lumens per watt; 180 lumens
per watt is ten times the efficacy of a standard 100-watt bulb.

>Yup...!

>It's hard to find good info on absolute efficiency of light bulbs;
these figures obviously all contradict one another.  Still, it seems
doubtful that fluorescents are 90% efficient.

*Uhhh, yes and no.

>One of the points the various lighting-efficiency pages made is that
you might be better off with a high-intensity discharge lamp (such as a
mercury light) in a situation like this.  HID lamps have some
disadvantages for normal use --- they take a few minutes to turn on,
they're not available in small wattages, and they have relatively poor
color rendition --- but those don't seem to figure here.

*Well, plants want a different color is all.  bnest is  one freq at one stage
of growth, and another later.  A certain one if you can only afford one.  1000
wats does an 8x8 area.  If you added low light plants at the periferey, you
could hit 10x10 or 56% more area.  10w/sq ft.

*BUt that's at 15 cents per hr, at say 10 hrs a day min., 30 da/mo.
That's $45 a month.  Better have a NEED or high cash crop.  (Hopefully,
legal.)

>> *Yeah... engineers are such jerks , huh.  Always with blindres on.
>> Can only see straight ahead, and only with that right hat on and
>> matching coffee cup and pencil protector.

>Uh, yeah.  Thanks.  Now, where did I put my "pencil protector"?

*I just keep several on hand.  Never know when you'lll need a backup.

Bill/ Zone 9.4973 +/- / 69% Sun / Baro 30.20 and steady, up 0.04 :>)
The specs say it's a nice day.... LOL

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