[Greenbuilding] looking for best 4' and 8' fluorescent shop light

[Steven Tjiang]

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"

---- Steve (KZ6LSD)


On Tue, Oct 4, 2011 at 1:28 PM, David Bergman <bergman at cyberg.com> wrote:

>  Hi Reuben,
>
> That type and number of lamps is going to depend on several variables:
>
> 1. Are you talking about bare-bulb down lights? Surface-mounted? Suspended?
> 2. How high is the ceiling?
> 3. How dark are the surfaces in the space?
> 4. How much brightness do you need/want?
> 5. How even do you want/need the lighting to be?
> 6. How often will the lights will be on? (If infrequently, perhaps you
> needn't agonize so much over getting the highest efficacy.)
>
> And probably some other variables as well.
>
> 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.
>
> Another minor variable: colder color/higher temperature fluorescents will
> usually have a higher efficacy.
>
> You can also dig a bit into http://www.nema.org/lampballastmatrix/
>
> This database,
> http://www.energystar.gov/index.cfm?c=lighting.pr_lighting_subcomponents ,
> is still under development.
>
> David Bergman  RA   LEED AP
> *DAVID BERGMAN* ARCHITECT / *FIRE & WATER* LIGHTING + FURNITURE
> architecture . interiors . ecodesign . lighting . furniture
> bergman at cyberg.com    *www.cyberg.com* <http://www.cyberg.com/>
> 241 Eldridge Street #3R, New York, NY 10002
> t 212 475 3106    f 212 677 7291
>
> At 04:14 PM 10/4/2011, Reuben Deumling wrote:
>
>
> On Tue, Oct 4, 2011 at 1:07 PM, Steven Tjiang <steve at tjiang.org> wrote:  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.
>
>
> 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?
> Or, more simply, what fluorescent tube light fixture/lamp/ballast package
> (4' and 8' versions ideally) will illuminate my basement with the fewest
> watts?
>
> Thanks.
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