My conclusion is basically the same as David Bergman. The bulbs themselves (all things equal) just don't vary all that much. I'd just closed my eyes and say "eeny-meeny-miney-moo"<div><br clear="all">---- Steve (KZ6LSD)<br>
<br><br><div class="gmail_quote">On Tue, Oct 4, 2011 at 1:28 PM, David Bergman <span dir="ltr"><<a href="mailto:bergman@cyberg.com">bergman@cyberg.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
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/" target="_blank">
http://www.nema.org/lampballastmatrix/<br><br>
</a>This database,
<a href="http://www.energystar.gov/index.cfm?c=lighting.pr_lighting_subcomponents" target="_blank">
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 color="#888888">
<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"><a href="mailto:bergman@cyberg.com" target="_blank">bergman@cyberg.com</a>
<a href="http://www.cyberg.com/" target="_blank"><u>www.cyberg.com</u></a>
</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 <a href="tel:212%20677%207291" value="+12126777291" target="_blank">212 677 7291</a></font><font color="#808080">
<br><br>
</font></font><div><div></div><div class="h5">At 04:14 PM 10/4/2011, Reuben Deumling wrote:<br><br>
<br>
</div></div><blockquote type="cite"><div><div></div><div class="h5">On Tue, Oct 4, 2011 at 1:07 PM,
Steven Tjiang
<<a href="mailto:steve@tjiang.org" target="_blank">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>
</dd></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></div></div><div class="im">
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