4 Mar
2015
4 Mar
'15
11:35 a.m.
My favorite online electronics discount store Electronic Goldmine is having
a special on some nice LED strips. They are doing an unusual 1-day sale
with a limited number available per customer. I already ordered my limit,
so if we want more of these, we should have a couple different people
ordering more ASAP.
I think the main strips of interest are these:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G20119
They are 14-LED 21.75" long AcuityBrands strips with a mix of "warm" and
"cold" white LEDs, totaling 10W (40V x 0.25A). That's the same brand as the
LED strips that are in the LED fixture in the CCL lab room, so should be
decent quality. Four of these should be about the same length and light
output as one of the 8ft T12 fluorescent bulbs, so we could just attach
them to the existing light fixtures.
They are $4 a piece with a limit or 5 per customer. A bit more expensive
than the Chinese LED spot lights that Jake ordered, but a strip light would
provide more even illumination to work by. They may or may not be better
quality: known US brand vs chinese supplier, but the ones Electric Goldmine
sells were presumably stripped out of some existing equipment.
They also have a sale on some strong 12-LED 15.25" long RGB LED strip
lights made by Konami Gaming. No hookup info, but they are selling them
dirt cheap: $5 for a package of five! (Limit 2 packages of 5 per customer)
http://www.goldmine-elec-products.com/prodinfo.asp?number=G20109A
Patrik
On Sun, Feb 15, 2015 at 11:03 AM, Patrik D'haeseleer <patrikd(a)gmail.com>
wrote:
As another point of comparison, the LED light fixture
I put in the CCL lab
room is this one:
http://www.homedepot.com/p/Lithonia-Lighting-2-ft-x-4-ft-White-LED-Prismati…
It's a 4000 Lumens, 45 Watt fixture made to resemble a fluorescent tube
one. Internally, it has four 36-LED strips behind a nice diffuser, and a
big-ass 30VDC/1.58A LED driver. (In comparison, that first bulb Jake posted
is 800 Lumen, so this one is equivalent in light output to about five of
those)
These sell for $119 at Home Depot, which is of course far too much. Should
be easy to reverse engineer these for far less, but I'm not sure how well
that would go over with our fire inspection, even if some of the chinese
knockoffs may very well pose more of fire hazard...
Patrik
On Sun, Feb 15, 2015 at 1:17 AM, Jake <jake(a)spaz.org> wrote:
so i guess sudoroom (and CCL too probably) need
some new lights, since
the flourescents are failing.
Home Despot sells 11-watt "warm white" bulbs for $9 each, which would be
a good idea if we had regular lamp sockets to screw bulbs into...
http://www.homedepot.com/p/Cree-60W-Equivalent-Daylight-
5000K-A19-Dimmable-LED-Light-Bulb-with-4Flow-Filament-
Design-BA19-08050OMF-12DE26-3U100/205597079?N=5yc1vZbm79
but china can always do better. I looked on Ali Express and sorted by
customer satisfaction, looking for LED lighting in "downlights" which
suggests lamps shining downward?
these look good but the seller rating is only 97.4%:
http://www.aliexpress.com/item/High-Quality-Aluminum-9W-
15W-21W-27W-45W-LED-Downlight-Ceiling-lights-lamp-AC85-265V-
With/2027740342.html
they seem to be "16 to 21" watts for $6.95 including shipping. They
offer "warm" and "cold" flavors so we could just get a mix of the
two
kinds, for something in the middle when they're all on.
here is the search i was doing:
http://www.aliexpress.com/category/200002289/led-
downlights.html?site=glo&isrefine=y&shipCountry=US&
SortType=total_weight_score_desc
this one is also a good price, and the seller rating is higher (98.1%)
http://www.aliexpress.com/item/21W-Antifogging-Epistar-
led-downlight-AC85-265V-Contains-the-drive-power-free-
shipping/2047334906.html
ultimately i have higher confidence in the quality of something we buy
from Cree at Home Despot, but I think we should give China a chance and buy
a few of the "16 to 21 watt" ones and see how they compare.
For reference, Cree (a reputable company) and other LED bulbs sold at
Home Despot are called "60 watt replacement" bulbs while actually using 9
to 11 watts. The light fixtures presently in Sudoroom and CCL each have
two 75-watt flourescent bulbs, for a total of 900 watts of light in the
bocce ball room when they're all working.
That suggests that 150 watts of LED lighting would be equivalent, which
would cost about $60 from the first aliexpress link i provided.
These lights just have wires coming out, so we would perhaps attach them
onto the metal structures that are presently holding flourescent lights for
simplicity, until we come up with something better.
-jake
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