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Hello Todd,<br>
We have been researching LED lighting for several years, and the best
outfit we've found is at: <br>
<a class="moz-txt-link-freetext" href="http://www.ledlightsinc.com/">http://www.ledlightsinc.com/</a>
near Sacramento CA.<br>
<br>
The data sheet for the 48" T8 replacement is:
<a class="moz-txt-link-freetext"
href="http://www.ledlightsinc.com/pdfs/4%27_20watt_BiPin_HO_LEDemail.pdf">http://www.ledlightsinc.com/pdfs/4'_20watt_BiPin_HO_LEDemail.pdf</a><br>
<br>
Note it runs on 12VDC, so if you're wiring is sized right you could
save the power supply cost and run
it straight off the batteries. Probably you could put 4 in series to
get 48 VDC too, but I haven't tried
it.<br>
<br>
The output is 2900 lumens whereas the generic flourescent T8 is 2500
lumens.<br>
<br>
<table border="0" cellpadding="2" cellspacing="2" width="450">
<tbody>
<tr>
<td valign="top">I put a pair into the 4 bulb fixture in our
kitchen with flourescent on
the outside and the LED's on the inside and the LED's seem visibly
brighter, as shown here.</td>
<td valign="top"><img alt="Fixture"
src="cid:part1.00090002.02060305@dcn.org" height="216" width="288"></td>
</tr>
</tbody>
</table>
<br>
These LED 48" T8's put out about 60% more light per watt than the
fluorescent T8, or use about 60% fewer watts for the same light output.
You could replace 8 fluorescents with 7 LEDs for the nearly the same
light.<br>
<br>
And that's not all, the LED's are good for 50K hours whereas the
fluorescents are good for ~10K, and need a ballast every two or three
lamp changes. The LEDs cost much more, but are about the same cost for
50K hours. The energy savings are doubled for an air conditioned
building, and the labor savings are significant too. Wal Mart is using
the 5' version of these in their freezer and refrigeration cases to
save energy. <br>
<br>
I have found several other manufacturer / importers for the T8 lamp,
none have the output that these do. Check out the California Lighting
Center at UC Davis: <a href="http://cltc.ucdavis.edu/">http://cltc.ucdavis.edu/</a>
for other LED solutions. <br>
<br>
Happy tidings, Dean Newberry<br>
<br>
Todd Cory wrote:
<blockquote cite="mid:493B1F12.2090104@finestplanet.com" type="cite">
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<font size="+1"><font face="Arial">Another efficiency option is to
wire
the 4 tube fixtures with two sets of two lamps that are independently
switchable. Or you could get really fancy and have three lighting
levels by switching one lamp on, three lamps on or all four in each
fixture. That way there are options for various lighting levels
depending on the needs.<br>
<br>
Todd<br>
<br>
<br>
</font></font><br>
Travis Creswell wrote:
<blockquote cite="midC8BA48379044485BA079275FEC741843@PC270429458147"
type="cite">
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Continuous
rows of four 4’ lamp T-8 fixtures
(8’ long) on 8’-12’ centers would be the ideal lighting
system in terms of performance, efficiency, installed price and
maintenance cost.
T-5’s are actually slightly less efficient and really don’t make
sense at mounting heights less then 20’. Plus T-5 lose more light
output then T-8 as temperatures decrease which starts to become
noticeable at
60f and really noticeable at 50f. Most shops are kept warm unless they
are being used and on the colder days it could take hours for the T-5
lights to
get to full output.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">I suggest
continuous rows because that
gives the owner a very uniformly lit space and tons of flexibility when
he
decides to reconfigure the shop in the future. “I can’t put
this machine over there because that’s the dark corner”. The
fewer the fixtures the worse the shadows which are a bad thing in work
shops
and continuous rows are essentially shadow free. For energy purposes I
would switch every other fixture for times when not as much light is
needed.
IE; 42’ long shop/8’ long fixtures = 5 fixtures per row with 1’
gap on each end of the row, 3 fixtures per row on one switch and two on
the
other. I would suggest the basic commodity grade 8’ white painted
fixture that every electrical supplier stocks plenty of. Typical cost
is $40-$45
each. No need for hoods (reflectors) at the heights you mention
especially
if the ceiling is white. 5000k 800 series lamps are the best lamp for
this application. F32T8SPX50 would be the GE part number and your
local supplier can easily cross that with what ever brand they carry.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Best,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Travis
Creswell<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Ozark Energy
Services<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
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<pre class="moz-signature" cols="72">--
Dean T. Newberry
Talbott Solar & Radiant Homes Inc.
430 D Street
Davis, CA 95616
T: 530 219-3606
F: 530 758-8187
E: <a class="moz-txt-link-abbreviated" href="mailto:deant@talbottsolar.com">deant@talbottsolar.com</a>
W: <a class="moz-txt-link-freetext" href="http://www.TalbottSolar.com/">http://www.TalbottSolar.com/</a>
<a class="moz-txt-link-freetext" href="http://www.TalbottRadiant.com/">http://www.TalbottRadiant.com/</a>
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