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Hi Reuben,<br><br>
That type and number of lamps is going to depend on several
variables:<br><br>
1. Are you talking about bare-bulb down lights? Surface-mounted?
Suspended?<br>
2. How high is the ceiling?<br>
3. How dark are the surfaces in the space?<br>
4. How much brightness do you need/want?<br>
5. How even do you want/need the lighting to be?<br>
6. How often will the lights will be on? (If infrequently, perhaps you
needn't agonize so much over getting the highest efficacy.)<br><br>
And probably some other variables as well.<br><br>
If you're talking about direct downlight, the efficacy will just be a
matter of the lumen output divided by the watts. There's no significant
efficiency loss due to the fixture (i.e. no shade/diffuser) assuming a
decent reflector above the bulbs. There is some variation in ballast
efficacy, but I suspect that so long as you select an Energy Star
labelled electronic ballast, the difference isn't that great.<br><br>
Another minor variable: colder color/higher temperature fluorescents will
usually have a higher efficacy.<br><br>
You can also dig a bit into
<a href="http://www.nema.org/lampballastmatrix/" eudora="autourl">
http://www.nema.org/lampballastmatrix/<br><br>
</a>This database,
<a href="http://www.energystar.gov/index.cfm?c=lighting.pr_lighting_subcomponents" eudora="autourl">
http://www.energystar.gov/index.cfm?c=lighting.pr_lighting_subcomponents</a>
, is still under development.<br><br>
David Bergman RA LEED AP<br>
<font size=2 color="#808080"><b>DAVID BERGMAN</b> ARCHITECT / <b>FIRE
& WATER</b> LIGHTING + FURNITURE<br>
</font><font color="#808080">architecture . interiors .
</font><font color="#008080">ecodesign</font><font color="#808080"> .
lighting . furniture<br>
</font><font size=2 color="#808080">bergman@cyberg.com
<a href="http://www.cyberg.com/" eudora="autourl"><u>www.cyberg.com</a>
</u></font><font color="#808080"> <br>
</font><font size=2 color="#808080">241 Eldridge Street #3R, New York, NY
10002<br>
</font><font color="#808080">t </font><font size=2 color="#808080">212
475 3106 f 212 677 7291</font><font color="#808080">
<br><br>
</font>At 04:14 PM 10/4/2011, Reuben Deumling wrote:<br><br>
<br>
<blockquote type=cite class=cite cite="">On Tue, Oct 4, 2011 at 1:07 PM,
Steven Tjiang
<<a href="mailto:steve@tjiang.org">steve@tjiang.org</a>> wrote:
<dl>
<dd> I went with the T8 for the closets because the strips are
readily available and cheap and T5's in the kitchen. I'd just let
form-factor and fit decided. I just bought the cheapest thing at
Home depot. No problems.<br><br>
</dl><br>
I guess I should rephrase my question: what is the highest lumens/watt
ratio you are aware of in a fluorescent fixture? Who makes it? Does it
come in a one-tube fixture? What are pros and cons of one vs. two tube?
<br>
Or, more simply, what fluorescent tube light fixture/lamp/ballast package
(4' and 8' versions ideally) will illuminate my basement with the fewest
watts? <br><br>
Thanks.<br>
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